SQL UPDATEdbo.ProductsSETProductName ='Flat Head Screwdriver'WHEREProductID =50GO 从表中读取数据 使用SELECT 语句可以读取表中的数据。 SELECT 语句是最重要的 Transact-SQL 语句之一,其语法有许多变体。 在本教程中,你将使用五个基础版本。 读取表中的数据 ...
如果你在此之前没有使用过SQL语言,或者还未真正理解它,那么注意学习本章的内容SELECT语句极其语法结构是SQL Server执行全部命令的基础。SELECT 语句的语法规则如下: SELECT [ALL|DISTINCT] [TOP (<expression>) [PERCENT] [WITH TIES] ] <column list> [FROM <source table(s)/view>] [WHERE <restrictive condi...
SQL CREATEPROCEDUREpr_Names @VarPrice moneyASBEGIN-- The print statement returns text to the userPRINT'Products less than '+CAST(@VarPriceASvarchar(10));-- A second statement starts hereSELECTProductName, PriceFROMvw_NamesWHEREPrice < @VarPrice;ENDGO ...
*/2UPDATEsc3SETgrade=grade+54WHEREgrade<7056/*将张三选修1号课程的成绩置零。*/7UPDATEsc8SETgrade=09WHEREcno=1andsnoin10(selectsnofromstudentwheresname='张三')111213/*将学号为1的学生的姓名改为张三十,年龄改小2岁。*/14UPDATEstudent15SETsname='张三十',sage=sage-2--同时更新多列16WHEREsno=11718...
This takes you to the article String Functions (Transact-SQL). What you will learn This tutorial shows you how to create a database, create a table in the database, insert data into the table, update the data, read the data, delete the data, and then delete the table. You will ...
在执行 mysql 语句时,出现1093 - You can't specify target table 'daily_job' for update in FROM clause这个错误。 二、错误原因 出现1093 - You can't specify target table 'daily_job' for update in FROM clause这个错误,它表面的意思是不能在同一个sql语句中,先select同一个表的某些值,然后再update...
Feature DTC Memory-optimized tables and natively compiled stored procedures cannot be accessed from distributed transactions. Use SQL transactions instead. Operation Memory-optimized tables as target of MERGE Memory-optimized tables cannot be the target of a MERGE operation. Use INSERT, UPDATE, and DELE...
[Update 20 March 2019: this functionality is now natively provided in SQL Server 2017+ / Azure SQL DB through the STRING_AGG intrinsic] Some time back, Dimitri Furman who works as a Senior Consultant in the Microsoft Services team shared a very useful tip. It pertains to a pattern of ...
UPDATE T1 SET datacol = 'Version4' WHERE keycol = 1 You should get an error notifying you that SQL Server cannot use snapshot isolation to access table T1 in database testdb and that you should retry your transaction. The WAITFOR Command The WAITFOR command has been enhanced in several...
update Person set @swap=Firstname set Firstname=Lastname set lastname=@swap If we see the problem from a SQL programmer we can translate the above prototype by using a temporary table “#swap”. The code should be like this: SELECT PersonId, FirstName , LastName INTO #swap FROM dbo.Pe...