oracle删除主键查看主键束缚及创建联合主键
1，主键的删除
ALTER TABLE TABLENAME DROP PRIMARY_KEY
履行上面的SQL可以删除主键；如果不成功可以用
ALTER TABLE TABLENAME DROP CONSTRAINTS COLUMN CASCADE; –删除束缚
ALTER TABLE TABLENAME DISABLE PRIMARY_COLUMN ; –设置被设置为主键的列为无效
DROP INDEX INDEX_NAME; –删除主键索引
2,查看主键束缚
SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE='P' AND TABLE_NAME='你要查看的表名' AND OWNER=USER
3,创建联合主键
ALTER TABLE ADD CONSTRAINTS ‘束缚名’ PRIMARY KEY (COLUMN,COLUMN,…);
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文章标题：oracle删除主键查看主键束缚及创建联合主键
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