truncate table**表名**删除整个表的记录,执行速度更快,用于清空大数据量表 注意,使用 truncate 前要确保数据可删除 select 语法结构(查询数据): 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select*select_list*# 指定查询内容 into*new_table_name*# 把查询结果存放到一个新表中
的列名称更新到表中 SET @SQL = 'ALTER TABLE YourTableName RENAME COLUMN ' + @NewColumnName + ' TO ' + ColumnName -- 执行动态SQL语句 EXEC sp_executesql @SQL -- 从临时表中删除已处理的列名称 DELETE FROM #TempColumns WHERE ColumnName = @NewColumnName END -- 删除临时表 DROP TABLE #...
alter table database.owner.table_name add column_name char(2) null ... sp_help table_name --- 显示表已有特征 create table table_name (name char(20), age smallint, lname varchar(30)) insert into table_name select ... --- 实现删除列的方法(创建新表) alter table table_name drop co...
alter table 表 alter column 列 数据类型 是否空 (修改一列) exec sp_rename '表.列名', '修改列名', 'column类型列' (修改列名) 创建约束 在创建表过程中完成create table INfoTable( ID int identity(1, 1) primary key not null, 主键约束 name varchar(10) unique not null 唯一约束 RoleID int ...
T-SQL in which ALTER TABLE statement has been utilized to add a column, to modify a column, to dropping a column or table, to rename a column or table in a database, so we can say that “ALTER TABLE” statement has been useful when we want to add, modify, drop or delete, rename...
] ] table_name TO new_table_name [;] -- Rename a database RENAME DATABASE [::] database_name TO new_database_name [;] -- Rename a column RENAME OBJECT [::] [ [ database_name . [schema_name ] ] . ] | [schema_name . ] ] table_name COLUMN column_name TO new_column_...
altercolumnbirthdaydatetime 6.修改列名: usebenet execsp_rename'student.sex(原始表内的列名)','性别(新列名)','column' --把列名“sex”改为“性别” 7.删除: 删除数据(注意:语句DELETE和DROP TABLE之间有一个非常重要的区别。DELETE删除一个表中的一部分或全部的内容。而DROP TABLE则将表的内容和表的大纲...
The output is a date/time type (based on the input), but at an interval governed by thedatepartandbucket_width. For example, if I wanted to simplify the output of a particular column so it just gave me the month boundaries, I might have done this in the past: ...
2.1.1.11 E051-09, Rename columns in the FROM clause 2.1.1.12 E081, Basic Privileges 2.1.1.13 E081-09, USAGE privilege 2.1.1.14 E121, Basic cursor support 2.1.1.15 E121-17, WITH HOLD cursors 2.1.1.16 E141, Basic integrity constraints 2.1.1.17 E141-07, Column defaults 2.1.1....
1、数据的添加Insert intotable_name(column1,column2,column3, …) Values(‘expression1’,’expression2’,’expression3’, …) 2、数据的修改: updatetable_name set column_name=… where <search_conditions> 3、数据的删除: 1)使用DELETE语句删除数据:Delete talbe_name Where search_conditions 2)使用TR...