Removes all rows from a table without logging the individual row deletions. TRUNCATE TABLE is similar to the DELETE statement with no WHERE clause; however, TRUNCATE TABLE is faster and uses fewer system and transaction log resources. 两者的区别在于Truncate快,而且释放日志所占资源,不记录由于删除行...
value (select Stockname , Stocknumber from Stock_table2) ---value为select语句 update update table_name set Stockname = "xxx" [where Stockid = 3] Stockname = default Stockname = null Stocknumber = Stockname + 4 delete delete from table_name where Stockid = 3 truncate table_name --- ...
truncate table 数据表 --删除整张表内容(只删除数据,保留表结构),没有保存具体删除日志,会截断数据并释放空间 1. 3、DELETE命令: 语法: delete table 数据表 where 条件 --删除内容不删除定义,不释放空间。会记录每条删除操作的日志,删除方式为一条一条删除,会记录每个删除操作的日志。 1. 总结: drop命令:删...
Delete tableUse the DELETE statement to remove all rows from the Products table: SQL Kopyala DELETE FROM Products; GO Use the DROP statement to remove the Products table: SQL Kopyala DROP TABLE Products; GO Remove databaseYou can't remove the TestData database while you are in the ...
21 Delete rows from CTE in SQL SERVER 1 SQL delete on group by conditions 1 Using a CTE in a Delete Statement SQL Server 2008 r2 3 DELETE With group by 0 TSQL - Delete All Rows Except 1 Per Group 0 delete duplicate records without using common table expression (CTE) 2 DELET...
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Operation TRUNCATE TABLE The TRUNCATE operation is not supported for memory-optimized tables. To remove all rows from a table, delete all rows using DELETE FROM table or drop and recreate the table. Operation ALTER AUTHORIZATION Changing the owner of an existing memory-optimized table or natively ...
DELETE T-SQL提供了两种删除数据的方式:DELETE与TRUNCATE,删除操作也是非幂等的,与UPDATE一样,我们可以借助事务防止误操作。 DELETE DELETEFROMtarget_table WHERE... 基于联接的DELETE 基于联接的DELETE操作是非标准的SQL。 示例如下: DELETEFROMSales.SalesPersonQuotaHistoryFROMSales.SalesPersonQuotaHistoryASspqhINNERJOIN...
UPDATE target_table SET field1[,field2] WHERE ... UPDATE操作不是幂等的,我们可以借助事务来防止误操作: 代码语言:txt 复制 BEGIN TRAN UPDATE ... ROLLBACK -- or COMMIT SQL中有all-at-once operations(同时操作)的概念,即出现在同一逻辑处理阶段的所有表达式在同一时间进行逻辑计算。基于同时操作的概念,...
1. truncate table is similar to delete statement with no where clause; 2. truncate table is faster and uses fewer system and transaction log resource (because truncate remove all rows from a table without logging the individual row deletions.) ...