Mysql 偷懒搞替换

-- mysql 查询数据库表名
-- 查询数据库中所有表名
select table_name from information_schema.tables where table_schema='ems' and table_type='base table';
-- 批量改表名
SELECT
CONCAT(
        'ALTER TABLE ',
        table_name,
        ' RENAME TO ',
        substring_index(table_name,'_tanli',1),
        ';'
    )  as  tableSql
FROM
information_schema. TABLES
WHERE
table_schema = 'ems'
AND table_type = 'base table'
AND  TABLE_NAME LIKE '%_tanli%';


-- 备份表
SELECT
CONCAT(
        'ALTER TABLE ',
substring_index(table_name,'_tanli',1),
        ' RENAME TO ',
        CONCAT(substring_index(table_name,'_tanli',1),'_TLBack'),
        ';'
    )  as  tableSql
FROM
information_schema. TABLES
WHERE
table_schema = 'ems'
AND table_type = 'base table'
AND  TABLE_NAME LIKE '%_tanli%';

-- 删除备份表 （多表）
SELECT
CONCAT(
        'drop table  ',
        CONCAT(substring_index(table_name,'_tanli',1),'_TLBack'),
        ';'
    )  as  tableSql
FROM
information_schema. TABLES
WHERE
table_schema = 'ems'
AND table_type = 'base table'
AND  TABLE_NAME LIKE '%_tanli%';

-- 少量表可以操作
SELECT
CONCAT('Drop table ',
group_concat(CONCAT(substring_index(table_name,'_tanli',1),'_TLBack')),
';')
FROM
information_schema. TABLES
WHERE
table_schema = 'ems'
AND table_type = 'base table'
AND  TABLE_NAME LIKE '%_tanli%';


-- 查询指定数据库中指定表的所有字段名column_name
select column_name from information_schema.columns where table_schema='csdb' and table_name='users'

SELECT
column_name
FROM
information_schema. COLUMNS
WHERE
table_schema = 'ems'
AND table_name = 'psc_app';