备注:测试数据库版本为MySQL 8.0

一.需求

我想查询某个库下所有表的总记录数

二.解决方案

-- 通过系统表 拼接sql
select concat('select count(*) from ',table_name,';') tab_count
 from information_schema.tables
 where table_schema = 'ZQS';

-- 拷贝输出进行执行
select count(*) from area_admin_contrast;
select count(*) from area_admin_info;
select count(*) from audit_log;
select count(*) from bb;
select count(*) from bonus;
select count(*) from char_test;
select count(*) from dept;
select count(*) from emp;
select count(*) from new_emps;
select count(*) from new_sal;
select count(*) from salgrade;
select count(*) from shawn_tmp;
select count(*) from t;
select count(*) from t1;
select count(*) from t2;
select count(*) from t4;
select count(*) from t_ctas;
select count(*) from t_date;
select count(*) from t_like;
select count(*) from test;
select count(*) from test1;
select count(*) from test_enum_set;
select count(*) from testa;
select count(*) from tmp_zqs;
select count(*) from user_info;
select count(*) from user_info_history;
select count(*) from users;
select count(*) from v;
select count(*) from zqs1;