Score
0
Watch 44 Star 256 Fork 69

xuthus / 数据库SQL实战SQLMIT

Create your Gitee Account
Explore and code with more than 6 million developers,Free private repositories !:)
Sign up
Clone or download
49.针对库中的所有表生成对应的SQL语句.md 1.28 KB
Copy Edit Web IDE Raw Blame History
xuthus authored 2019-08-12 23:23 . add:all

针对库中的所有表生成select count(*)对应的SQL语句

题目描述

针对库中的所有表生成select count(*)对应的SQL语句

CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`));
create table emp_bonus(
emp_no int not null,
recevied datetime not null,
btype smallint not null);
CREATE TABLE `dept_emp` (
`emp_no` int(11) NOT NULL,
`dept_no` char(4) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
CREATE TABLE `dept_manager` (
`dept_no` char(4) NOT NULL,
`emp_no` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
CREATE TABLE `salaries` (
`emp_no` int(11) NOT NULL,
`salary` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`from_date`));

答案

select "select count(*) from " || name || ";" cnts from sqlite_master where type = "table"

题解

MySQL语法:

select concat('select count(*) from ',TABLE_NAME,';') cnts from (select TABLE_NAME from information_schema.TABLES where TABLE_SCHEMA = 'employees') t

Comment ( 0 )

Sign in for post a comment