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SQL UNIQUE 约束 - w3school 在线教程
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SQL UNIQUE 约束 - w3school 在线教程
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http://www.w3school.com.cn/sql/sql_unique.asp
Category:
Chlorides, Sulfates, Carbonates
SQL UNIQUE Constraint on ALTER TABLE 当表已被创建时,如需在 "Id_P" 列创建 UNIQUE 约束,请使用下列 SQL: MySQL / SQL Server / Oracle / MS Access: ALTER ...
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