查询MySQL数据库/表相关信息的SQL语句: SHOW DATABASES //列出 MySQL Server 数据库. SHOW TABLES [FROM db_name] //列出数据库数据表. SHOW CREATE TABLES tbl_name //导出数据表结构. SHOW TABLE STATUS [FROM db_name] //列出数据表及表状态信息. SHOW COLUMNS FROM tbl_name [FROM db_name] //列出资料表字段 SHOW FIELD
一.mysql关联表批量修改 UPDATE sp_sys_dictionaries_category a #根据对应id,把b.username的值赋给a.username LEFT JOIN sp_sys_dictionaries b ON b.cid = a.id SET a.username = b.username 二.sqlserver关联表批量修改 UPDATE a SET a.FLONGYARN = b.ORGID --根据对应id,把b.ORGID的值赋给a.FLONGYARN