SQL 二张表数据复制语句
1. sql 子查询应用
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UPDATE hj_cy_jws uset yyid = ( SELECT DISTINCT hj.yyid FROM hj_cy_jws jw JOIN hj_cy hj ON jw.grid = hj.grid WHERE u.grid = hj.grid )WHERE EXISTS ( SELECT * FROM hj_cy_jws jw JOIN hj_cy hj ON jw.grid = hj.grid WHERE u.grid = hj.grid )
