delete from table_name where Stockid = 3 truncate table_name --- 删除表中所有行,仍保持表的完整性 drop table table_name --- 完全删除表 alter table --- 修改数据库表结构 alter table database.owner.table_name add column_name char(2) null .. sp_help table_name --- 显示表已有特征 crea...
SQL 查询表外键_T-Sql 2016——级联删除外键查询 SELECT fk.name AS foreign_key_name, oSub.name AS table_name, SubCol.name AS table_column, oMain.name AS references_table_name, MainCol.name AS references_table_column, fk.delete_referential_action_desc FROM sys.foreign_keys fk JOIN sys.all...
deletefrom tbl where idin(selectmax(id)from tbl a whereEXISTS(select1from tbl b where a.tac=b.tac group by tacHAVINGcount(1)>1)group by tac) 也就是说将select出的结果再通过中间表select一遍,这样就规避了错误。注意,这个问题只出现于mysql,mssql和Oracle不会出现此问题。 代码语言:javascript 代...
IF(COLUMNS_UPDATED()&01)>0 UPDATE Employees SET DepartmentlD=(SELECT ins.DepartmentlD from INSERTED ins) WHERE DepaxtmentlD=(SELECT DepartmentlD FROM deleted) END GO ③删除Departments表中1条记录的同时删除该记录departmentlD字段值在Employees表 USE YGGL GO CREATE TRIGGER DepartmentsDelete On db.Depar...
Joins in T-SQL are clauses used to combine rows from two or more tables, based on a related column between them. Joins specify how SQL should use data from one table to select the rows in another table. Several operators -- such as =, <, >, <>, <=, >=, !=, BETWEEN, LIKE,...
Feature Computed columns Applies to: SQL Server 2014 (12.x) and SQL Server 2016 (13.x)Computed columns are not supported for memory-optimized tables. Remove the computed columns from the CREATE TABLE statement.Azure SQL Database and SQL Server starting SQL Server 2017 (14.x) do support comp...
using (DeleteAction delete = new DeleteAction(Entity)) { delete.SqlWhere(cms_user.Columns.id, "1,2,3,4,5", RelationEnum.In); delete.Excute(); return delete.ReturnCode; } using (UpdateAction update = new UpdateAction(Entity)) { update.SqlKeyValue(cms_user.Columns.createtime, null); ...
IF(COLUMNS_UPDATED()&01)>0 UPDATE Employees SET DepartmentlD=(SELECT ins.DepartmentlD from INSERTED ins) WHERE DepaxtmentlD=(SELECT DepartmentlD FROM deleted) END GO ③删除Departments表中1条记录的同时删除该记录departmentlD字段值在Employees表 USE YGGL ...
mybatis传递参数有两种方式 #{param} 这种传递的是带双引号的变量 ${param} 这种传滴的是字面量 比如 tab = tb_user select * from...#{tab} 就会被解释成 select * from 'tb_user' 这样肯定是不对的,sql语句中的表...
SqlServer.TransactSql.ScriptDom Microsoft.SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource ...