文件名称：IQ_16 SQL 语句应用
文件大小：1.09MB
文件格式：DOCX
更新时间：2018-10-07 04:03:56
SQL 语句
Alter Table基本语法: ALTER TABLE [owner.] table-name { ADD column-definition [column-constraint]...| ADD table-constraint | MODIFY column-name [NOT] NULL | { DELETE | DROP } column-name | { DELETE | DROP } UNIQUE (column-name [, ...])| { DELETE | DROP } PRIMARY KEY | RENAME new-table-name | RENAME column-name TO new-column-name }