DATETIME 日期时间 格式:YYYY-MM-DD HH:MM:SS 范围:1753-1-1 ~ 9999-12-31 占用8字节空间DATETIME2 日期时间(比DATETIME范围更大,精度更高) 格式:YYYY-MM-DD HH:MM:SS[.nnnnnnn] 范围:0001-01-01 ~ 9999-12-31 可以定义DATETINE2(小数位数)来定义高精度时间 占用6
DATEDIFF(<datepart> ,<number> ,<date>) --函数返回两个指定日期在datepart 方面的不同之处 DATENAME(<datepart> , <date>) --函数以字符串的形式返回日期的指定部分 DATEPART(<datepart> , <date>) --函数以整数值的形式返回日期的指定部分 GETDATE() --函数以DATETIME 的缺省格式返回系统当前的日期和时间...
DATEDIFF(<datepart> ,<number> ,<date>) --函数返回两个指定日期在datepart 方面的不同之处 DATENAME(<datepart> , <date>) --函数以字符串的形式返回日期的指定部分 DATEPART(<datepart> , <date>) --函数以整数值的形式返回日期的指定部分 GETDATE() --函数以DATETIME 的缺省格式返回系统当前的日期和时间...
Disable the constraints,TRUNCATEthe table, and reenable the constraints. I don't know yet. 7. You examine the execution plan for anUPDATEstatement that you are executing on a table variable. Why does the execution plan for this query always comes out as serial despite your trials to change ...
l_date DATE := to_date('31-JUL-02'); T-SQL要變量與賦值分割開來 declare @sDate datetime set @sDate=getdate() 注意賦值符號不一樣。PL/SQL是":=", T-SQL是"=" 以下是PL/SQL的Declaration section的賦值語句示範: declare hire date date; /* implicit initialization with null */ ...
modified DATETIME NOT NULL DEFAULT GETDATE() ); 2. Using CHAR Data Type in Variable Declaration The following defines the variable @name as CHAR(25). Then, we set the value to it and determine its length in bytes and the number of characters. ...
--1.0准备数据USEtempdb;IFOBJECT_ID('dbo.Orders','U')ISNOTNULLDROPTABLEdbo.Orders;GOCREATETABLEdbo.Orders(orderidINTNOTNULL,orderdateDATENOTNULL,--prior toSQLServer2008useDATETIMEempidINTNOTNULL,custidVARCHAR(5)NOTNULL,qtyINTNOTNULL,CONSTRAINTPK_OrdersPRIMARYKEY(orderid));INSERTINTOdbo.Orders(order...
Automated Conversion from T-SQL to ANSI SQL? Automatic Truncate Long Strings while inserting data. Automatically import the CSV files from a Folder Automatically UpperCase ALL MS SQL Server Keywords AutoNumber in T-SQL Select Statement AVG ->Operand data type varchar is invalid for avg operator av...
2.1.2.42 F202, TRUNCATE TABLE: identity column restart option 2.1.2.43 F231, Privilege tables 2.1.2.44 F231-03, USAGE_PRIVILEGES view 2.1.2.45 F251, Domain support 2.1.2.46 F271, Compound character literals 2.1.2.47 F291, UNIQUE predicate 2.1.2.48 F301, CORRESPONDING in query expressions...
WITH { NO_LOG | TRUNCATE_ONLY } [;] <backup_device>::= { { logical_device_name | @logical_device_name_var } | { DISK | TAPE } = { 'physical_device_name' | @physical_device_name_var } } <MIRROR TO clause>::= MIRROR TO <backup_device> [ ,...n ] ...