获取表的primary key
SELECT cu.Column_Name FROM INFORMATION_SCHEMA.TABL删除user表(含字段id和字段name)中重复的name字段,保留唯一的name字段,要求保留的name对应的id值最小
delete from user where id not in(select min(id) fr- 0
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sqllite 判断 某个id是否存在于表中了,如果存在则不插入,不存在则插入
INSERT INTO USER (email,ADDTIME) (SELECT 'email','- 0
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