Smalldatetime (transact-sql)smalldatetime (transact-sql)

UPDATE таблица

Следующая инструкция SQL обновляет первого клиента (CustomerID = 1) с новым контактным лицом и новым городом.

Пример

UPDATE Customers
SET ContactName = ‘Alfred Schmidt’, City= ‘Frankfurt’
WHERE CustomerID = 1;

Выбор из таблицы «Customers» теперь будет выглядеть следующим образом:

CustomerID CustomerName ContactName Address City PostalCode Country
1 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 Frankfurt 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

SQL Учебник

SQL ГлавнаяSQL ВведениеSQL СинтаксисSQL SELECTSQL SELECT DISTINCTSQL WHERESQL AND, OR, NOTSQL ORDER BYSQL INSERT INTOSQL Значение NullSQL Инструкция UPDATESQL Инструкция DELETESQL SELECT TOPSQL MIN() и MAX()SQL COUNT(), AVG() и …SQL Оператор LIKESQL ПодстановочныйSQL Оператор INSQL Оператор BETWEENSQL ПсевдонимыSQL JOINSQL JOIN ВнутриSQL JOIN СлеваSQL JOIN СправаSQL JOIN ПолноеSQL JOIN СамSQL Оператор UNIONSQL GROUP BYSQL HAVINGSQL Оператор ExistsSQL Операторы Any, AllSQL SELECT INTOSQL INSERT INTO SELECTSQL Инструкция CASESQL Функции NULLSQL ХранимаяSQL Комментарии

CONVERT_TZ(dt,from_tz,to_tz)

This converts a datetime value dt from the time zone given by from_tz to the time zone given by to_tz and returns the resulting value. This function returns NULL if the arguments are invalid.

mysql> SELECT CONVERT_TZ('2004-01-01 12:00:00','GMT','MET');
+---------------------------------------------------------+
| CONVERT_TZ('2004-01-01 12:00:00','GMT','MET')           |
+---------------------------------------------------------+
| 2004-01-01 13:00:00                                     |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT CONVERT_TZ('2004-01-01 12:00:00','+00:00','+10:00');
+---------------------------------------------------------+
| CONVERT_TZ('2004-01-01 12:00:00','+00:00','+10:00')     |
+---------------------------------------------------------+
| 2004-01-01 22:00:00                                     |
+---------------------------------------------------------+
1 row in set (0.00 sec)

SQL Справочник

SQL Ключевые слова
ADD
ADD CONSTRAINT
ALTER
ALTER COLUMN
ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
CONSTRAINT
CREATE
CREATE DATABASE
CREATE INDEX
CREATE OR REPLACE VIEW
CREATE TABLE
CREATE PROCEDURE
CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
HAVING
IN
INDEX
INNER JOIN
INSERT INTO
INSERT INTO SELECT
IS NULL
IS NOT NULL
JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Функции
Функции строк
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
FIELD
FIND_IN_SET
FORMAT
INSERT
INSTR
LCASE
LEFT
LENGTH
LOCATE
LOWER
LPAD
LTRIM
MID
POSITION
REPEAT
REPLACE
REVERSE
RIGHT
RPAD
RTRIM
SPACE
STRCMP
SUBSTR
SUBSTRING
SUBSTRING_INDEX
TRIM
UCASE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATAN2
AVG
CEIL
CEILING
COS
COT
COUNT
DEGREES
DIV
EXP
FLOOR
GREATEST
LEAST
LN
LOG
LOG10
LOG2
MAX
MIN
MOD
PI
POW
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SUM
TAN
TRUNCATE
Функции дат
ADDDATE
ADDTIME
CURDATE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURTIME
DATE
DATEDIFF
DATE_ADD
DATE_FORMAT
DATE_SUB
DAY
DAYNAME
DAYOFMONTH
DAYOFWEEK
DAYOFYEAR
EXTRACT
FROM_DAYS
HOUR
LAST_DAY
LOCALTIME
LOCALTIMESTAMP
MAKEDATE
MAKETIME
MICROSECOND
MINUTE
MONTH
MONTHNAME
NOW
PERIOD_ADD
PERIOD_DIFF
QUARTER
SECOND
SEC_TO_TIME
STR_TO_DATE
SUBDATE
SUBTIME
SYSDATE
TIME
TIME_FORMAT
TIME_TO_SEC
TIMEDIFF
TIMESTAMP
TO_DAYS
WEEK
WEEKDAY
WEEKOFYEAR
YEAR
YEARWEEK
Функции расширений
BIN
BINARY
CASE
CAST
COALESCE
CONNECTION_ID
CONV
CONVERT
CURRENT_USER
DATABASE
IF
IFNULL
ISNULL
LAST_INSERT_ID
NULLIF
SESSION_USER
SYSTEM_USER
USER
VERSION

SQL Server функции
Функции строк
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SQUARE
SUM
TAN
Функции дат
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR
Функции расширений
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access функции
Функции строк
Asc
Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase
Функции чисел
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val
Функции дат
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year
Другие функции
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL ОператорыSQL Типы данныхSQL Краткий справочник

SQL Учебник

SQL ГлавнаяSQL ВведениеSQL СинтаксисSQL SELECTSQL SELECT DISTINCTSQL WHERESQL AND, OR, NOTSQL ORDER BYSQL INSERT INTOSQL Значение NullSQL Инструкция UPDATESQL Инструкция DELETESQL SELECT TOPSQL MIN() и MAX()SQL COUNT(), AVG() и …SQL Оператор LIKESQL ПодстановочныйSQL Оператор INSQL Оператор BETWEENSQL ПсевдонимыSQL JOINSQL JOIN ВнутриSQL JOIN СлеваSQL JOIN СправаSQL JOIN ПолноеSQL JOIN СамSQL Оператор UNIONSQL GROUP BYSQL HAVINGSQL Оператор ExistsSQL Операторы Any, AllSQL SELECT INTOSQL INSERT INTO SELECTSQL Инструкция CASESQL Функции NULLSQL ХранимаяSQL Комментарии

SQL Справочник

SQL Ключевые слова
ADD
ADD CONSTRAINT
ALTER
ALTER COLUMN
ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
CONSTRAINT
CREATE
CREATE DATABASE
CREATE INDEX
CREATE OR REPLACE VIEW
CREATE TABLE
CREATE PROCEDURE
CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
HAVING
IN
INDEX
INNER JOIN
INSERT INTO
INSERT INTO SELECT
IS NULL
IS NOT NULL
JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Функции
Функции строк
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
FIELD
FIND_IN_SET
FORMAT
INSERT
INSTR
LCASE
LEFT
LENGTH
LOCATE
LOWER
LPAD
LTRIM
MID
POSITION
REPEAT
REPLACE
REVERSE
RIGHT
RPAD
RTRIM
SPACE
STRCMP
SUBSTR
SUBSTRING
SUBSTRING_INDEX
TRIM
UCASE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATAN2
AVG
CEIL
CEILING
COS
COT
COUNT
DEGREES
DIV
EXP
FLOOR
GREATEST
LEAST
LN
LOG
LOG10
LOG2
MAX
MIN
MOD
PI
POW
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SUM
TAN
TRUNCATE
Функции дат
ADDDATE
ADDTIME
CURDATE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURTIME
DATE
DATEDIFF
DATE_ADD
DATE_FORMAT
DATE_SUB
DAY
DAYNAME
DAYOFMONTH
DAYOFWEEK
DAYOFYEAR
EXTRACT
FROM_DAYS
HOUR
LAST_DAY
LOCALTIME
LOCALTIMESTAMP
MAKEDATE
MAKETIME
MICROSECOND
MINUTE
MONTH
MONTHNAME
NOW
PERIOD_ADD
PERIOD_DIFF
QUARTER
SECOND
SEC_TO_TIME
STR_TO_DATE
SUBDATE
SUBTIME
SYSDATE
TIME
TIME_FORMAT
TIME_TO_SEC
TIMEDIFF
TIMESTAMP
TO_DAYS
WEEK
WEEKDAY
WEEKOFYEAR
YEAR
YEARWEEK
Функции расширений
BIN
BINARY
CASE
CAST
COALESCE
CONNECTION_ID
CONV
CONVERT
CURRENT_USER
DATABASE
IF
IFNULL
ISNULL
LAST_INSERT_ID
NULLIF
SESSION_USER
SYSTEM_USER
USER
VERSION

SQL Server функции
Функции строк
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SQUARE
SUM
TAN
Функции дат
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR
Функции расширений
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access функции
Функции строк
Asc
Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase
Функции чисел
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val
Функции дат
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year
Другие функции
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL ОператорыSQL Типы данныхSQL Краткий справочник

SQL Справочник

SQL Ключевые слова
ADD
ADD CONSTRAINT
ALTER
ALTER COLUMN
ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
CONSTRAINT
CREATE
CREATE DATABASE
CREATE INDEX
CREATE OR REPLACE VIEW
CREATE TABLE
CREATE PROCEDURE
CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
HAVING
IN
INDEX
INNER JOIN
INSERT INTO
INSERT INTO SELECT
IS NULL
IS NOT NULL
JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Функции
Функции строк
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
FIELD
FIND_IN_SET
FORMAT
INSERT
INSTR
LCASE
LEFT
LENGTH
LOCATE
LOWER
LPAD
LTRIM
MID
POSITION
REPEAT
REPLACE
REVERSE
RIGHT
RPAD
RTRIM
SPACE
STRCMP
SUBSTR
SUBSTRING
SUBSTRING_INDEX
TRIM
UCASE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATAN2
AVG
CEIL
CEILING
COS
COT
COUNT
DEGREES
DIV
EXP
FLOOR
GREATEST
LEAST
LN
LOG
LOG10
LOG2
MAX
MIN
MOD
PI
POW
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SUM
TAN
TRUNCATE
Функции дат
ADDDATE
ADDTIME
CURDATE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURTIME
DATE
DATEDIFF
DATE_ADD
DATE_FORMAT
DATE_SUB
DAY
DAYNAME
DAYOFMONTH
DAYOFWEEK
DAYOFYEAR
EXTRACT
FROM_DAYS
HOUR
LAST_DAY
LOCALTIME
LOCALTIMESTAMP
MAKEDATE
MAKETIME
MICROSECOND
MINUTE
MONTH
MONTHNAME
NOW
PERIOD_ADD
PERIOD_DIFF
QUARTER
SECOND
SEC_TO_TIME
STR_TO_DATE
SUBDATE
SUBTIME
SYSDATE
TIME
TIME_FORMAT
TIME_TO_SEC
TIMEDIFF
TIMESTAMP
TO_DAYS
WEEK
WEEKDAY
WEEKOFYEAR
YEAR
YEARWEEK
Функции расширений
BIN
BINARY
CASE
CAST
COALESCE
CONNECTION_ID
CONV
CONVERT
CURRENT_USER
DATABASE
IF
IFNULL
ISNULL
LAST_INSERT_ID
NULLIF
SESSION_USER
SYSTEM_USER
USER
VERSION

SQL Server функции
Функции строк
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SQUARE
SUM
TAN
Функции дат
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR
Функции расширений
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access функции
Функции строк
Asc
Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase
Функции чисел
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val
Функции дат
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year
Другие функции
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL ОператорыSQL Типы данныхSQL Краткий справочник

FROM_UNIXTIME(unix_timestamp,format)

Returns a representation of the unix_timestamp argument as a value in ‘YYYY-MM-DD HH:MM:SS or YYYYMMDDHHMMSS format, depending on whether the function is used in a string or in a numeric context. The value is expressed in the current time zone. The unix_timestamp argument is an internal timestamp values, which are produced by the UNIX_TIMESTAMP() function.

If the format is given, the result is formatted according to the format string, which is used in the same way as is listed in the entry for the DATE_FORMAT() function.

mysql> SELECT FROM_UNIXTIME(875996580);
+---------------------------------------------------------+
| FROM_UNIXTIME(875996580)                                |
+---------------------------------------------------------+
| 1997-10-04 22:23:00                                     |
+---------------------------------------------------------+
1 row in set (0.00 sec)

UNIX_TIMESTAMP(), UNIX_TIMESTAMP(date)

If called with no argument, this function returns a Unix timestamp (seconds since ‘1970-01-01 00:00:00’ UTC) as an unsigned integer. If UNIX_TIMESTAMP() is called with a date argument, it returns the value of the argument as seconds since ‘1970-01-01 00:00:00’ UTC. date may be a DATE string, a DATETIME string, a TIMESTAMP, or a number in the format YYMMDD or YYYYMMDD.

mysql> SELECT UNIX_TIMESTAMP();
+---------------------------------------------------------+
| UNIX_TIMESTAMP()                                        |
+---------------------------------------------------------+
| 882226357                                               |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT UNIX_TIMESTAMP('1997-10-04 22:23:00');
+---------------------------------------------------------+
| UNIX_TIMESTAMP('1997-10-04 22:23:00')                   |
+---------------------------------------------------------+
| 875996580                                               |
+---------------------------------------------------------+
1 row in set (0.00 sec)

STR_TO_DATE(str,format)

This is the inverse of the DATE_FORMAT() function. It takes a string str and a format string format. The STR_TO_DATE() function returns a DATETIME value if the format string contains both date and time parts. Else, it returns a DATE or TIME value if the string contains only date or time parts.

mysql> SELECT STR_TO_DATE('04/31/2004', '%m/%d/%Y');
+---------------------------------------------------------+
| STR_TO_DATE('04/31/2004', '%m/%d/%Y')                   |
+---------------------------------------------------------+
| 2004-04-31                                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)

ПримечанияRemarks

Функция SYSDATETIMEOFFSET может использоваться в инструкциях Transact-SQLTransact-SQL везде, где допустимо использование выражения datetimeoffset.Transact-SQLTransact-SQL statements can refer to SYSDATETIMEOFFSET anywhere they can refer to a datetimeoffset expression.

Функция SYSDATETIMEOFFSET недетерминированная.SYSDATETIMEOFFSET is a nondeterministic function. Невозможно проиндексировать представления и выражения, ссылающиеся на эту функцию в столбце.Views and expressions that reference this function in a column cannot be indexed.

Примечание

SQL ServerSQL Server получает значения даты и времени с помощью функции GetSystemTimeAsFileTime() Windows API.obtains the date and time values by using the GetSystemTimeAsFileTime() Windows API. Точность зависит от физического оборудования и версии Windows, в которой запущен экземпляр SQL ServerSQL Server.The accuracy depends on the computer hardware and version of Windows on which the instance of SQL ServerSQL Server is running. Точность возвращаемых значений этого API-интерфейса задана равной 100 нс.The precision of this API is fixed at 100 nanoseconds. Точность может быть определена с помощью метода GetSystemTimeAdjustment() интерфейса API Windows.The accuracy can be determined by using the GetSystemTimeAdjustment() Windows API.

SQL Учебник

SQL ГлавнаяSQL ВведениеSQL СинтаксисSQL SELECTSQL SELECT DISTINCTSQL WHERESQL AND, OR, NOTSQL ORDER BYSQL INSERT INTOSQL Значение NullSQL Инструкция UPDATESQL Инструкция DELETESQL SELECT TOPSQL MIN() и MAX()SQL COUNT(), AVG() и …SQL Оператор LIKESQL ПодстановочныйSQL Оператор INSQL Оператор BETWEENSQL ПсевдонимыSQL JOINSQL JOIN ВнутриSQL JOIN СлеваSQL JOIN СправаSQL JOIN ПолноеSQL JOIN СамSQL Оператор UNIONSQL GROUP BYSQL HAVINGSQL Оператор ExistsSQL Операторы Any, AllSQL SELECT INTOSQL INSERT INTO SELECTSQL Инструкция CASESQL Функции NULLSQL ХранимаяSQL Комментарии

Нецелочисленные числовые типыNonintegral Numeric Types

Нецелочисленные типы данных — это значения, представляющие числа с целой и дробной частями.Nonintegral data types are those that represent numbers with both integer and fractional parts.

Нецелочисленные числовые типы данных: (128-разрядная Фиксированная точка), один тип данных (32-разрядная с плавающей запятой) и тип данных double (64-разрядный с плавающей запятой).The nonintegral numeric data types are (128-bit fixed point), Single Data Type (32-bit floating point), and Double Data Type (64-bit floating point). Все типы со знаком.They are all signed types. Если переменная может содержать дробную часть, объявите ее как один из этих типов.If a variable can contain a fraction, declare it as one of these types.

не является типом данных с плавающей запятой. is not a floating-point data type. числа имеют двоичное целочисленное значение и коэффициент масштабирования целого числа, который указывает, какая часть значения является десятичной дробью. numbers have a binary integer value and an integer scaling factor that specifies what portion of the value is a decimal fraction.

Вы можете использовать переменные для денежных значений.You can use variables for money values. Преимущество — точность значений.The advantage is the precision of the values. Тип данных является более быстрым и требует меньше памяти, но он подвергается ошибкам округления.The data type is faster and requires less memory, but it is subject to rounding errors. Тип данных сохраняет полную точность до 28 десятичных разрядов.The data type retains complete accuracy to 28 decimal places.

Числа с плавающей запятой ( и ) имеют большие диапазоны, чем числа, но могут подвергаться ошибкам округления.Floating-point ( and ) numbers have larger ranges than numbers but can be subject to rounding errors. Типы с плавающей запятой поддерживают меньше значащих цифр , чем, но могут представлять значения большей величины.Floating-point types support fewer significant digits than but can represent values of greater magnitude.

Нецелочисленные числовые значения можно выразить как Мммии, в котором MMM является мантиссаом (значащими цифрами), а ие — экспонентой (степенью 10).Nonintegral number values can be expressed as mmmEeee, in which mmm is the mantissa (the significant digits) and eee is the exponent (a power of 10). Самыми высокими положительными значениями нецелочисленных типов являются 7.9228162514264337593543950335 E + 28 для , 4028235E e + 38 для и 1.79769313486231570 e + 308 для .The highest positive values of the nonintegral types are 7.9228162514264337593543950335E+28 for , 3.4028235E+38 for , and 1.79769313486231570E+308 for .

ПроизводительностьPerformance

является наиболее эффективным из типов данных дробной части, так как процессоры на текущих платформах выполняют операции с плавающей запятой с двойной точностью. is the most efficient of the fractional data types, because the processors on current platforms perform floating-point operations in double precision. Однако операции с не так быстро, как с целочисленными типами, такими как .However, operations with are not as fast as with the integral types such as .

Небольшие величиныSmall Magnitudes

Для чисел с наименьшей возможной величиной (ближайшее к 0) переменные могут содержать цифры как небольшие, например, 4.94065645841246544 e-324 для отрицательных значений и 4.94065645841246544 e-324 для положительных значений.For numbers with the smallest possible magnitude (closest to 0), variables can hold numbers as small as -4.94065645841246544E-324 for negative values and 4.94065645841246544E-324 for positive values.

Небольшие дробные числаSmall Fractional Numbers

Если не требуется полный диапазон типа данных, можно использовать тип данных, который может содержать числа с плавающей запятой в диапазоне от-4028235E e + 38 до 4028235E e + 38.If you do not need the full range of the data type, you can use the data type, which can hold floating-point numbers from -3.4028235E+38 through 3.4028235E+38. Наименьшими значениями для переменных являются-1.401298 e-45 для отрицательных значений и 1.401298 e-45 для положительных значений.The smallest magnitudes for variables are -1.401298E-45 for negative values and 1.401298E-45 for positive values. При наличии очень большого числа переменных, содержащих небольшие числа с плавающей запятой, среда CLR иногда может более эффективно хранить переменные и экономить потребление памяти.If you have a very large number of variables that hold small floating-point numbers, the common language runtime can sometimes store your variables more efficiently and save memory consumption.

SQL References

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SQL Quick Ref

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SQL Справочник

SQL Ключевые слова
ADD
ADD CONSTRAINT
ALTER
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ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
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CREATE OR REPLACE VIEW
CREATE TABLE
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CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
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IN
INDEX
INNER JOIN
INSERT INTO
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IS NULL
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JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Функции
Функции строк
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
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TIMEDIFF
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Функции расширений
BIN
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CASE
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VERSION

SQL Server функции
Функции строк
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
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FORMAT
LEFT
LEN
LOWER
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QUOTENAME
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RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
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UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATN2
AVG
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COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
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MAX
MIN
PI
POWER
RADIANS
RAND
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SIGN
SIN
SQRT
SQUARE
SUM
TAN
Функции дат
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
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DAY
GETDATE
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MONTH
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YEAR
Функции расширений
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access функции
Функции строк
Asc
Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase
Функции чисел
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val
Функции дат
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
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Другие функции
CurrentUser
Environ
IsDate
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