SQL语言教程(经典)

时间:2014-04-20 14:07:48
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文件名称:SQL语言教程(经典)

文件大小:553KB

文件格式:PDF

更新时间:2014-04-20 14:07:48

SQL

SQL语言教程,入门经典 使用Transact-SQL语句修改表 语法格式: ALTER TABLE table_name { [ALTER COLUMN column_name { new_data_type [(precision [, scale])] [NULL|NOT NULL] | {ADD|DROP} ROWGUIDCOL } ] | ADD { [ ] | column_name AS computed_column_expression }[ , ... n ] | [ WITH CHECK | WITH NOCHECK] ADD { } [ , ... n] | DROP { [CONSTRAINT] constraint_name | COLUMN column_name} [ , ... n] |{CHECK | NOCHECK} CONSTRAINT {ALL | constraint_name [ , ... n]} |{ ENABLE | DISABLE } TRIGGER { ALL | trigger_name [ , ... n]} }


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