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xuthus / 数据库SQL实战SQLMIT

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44.将id=5以及emp_no=10001的行数据替换成id=5以及emp_no=10005.md 1.06 KB
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xuthus authored 2019-08-12 23:23 . add:all

将id=5以及emp_no=10001的行数据替换成id=5以及emp_no=10005

题目描述

将id=5以及emp_no=10001的行数据替换成id=5以及emp_no=10005,其他数据保持不变,使用replace实现。

CREATE TABLE IF NOT EXISTS titles_test (
id int(11) not null primary key,
emp_no int(11) NOT NULL,
title varchar(50) NOT NULL,
from_date date NOT NULL,
to_date date DEFAULT NULL);

insert into titles_test values ('1', '10001', 'Senior Engineer', '1986-06-26', '9999-01-01'),
('2', '10002', 'Staff', '1996-08-03', '9999-01-01'),
('3', '10003', 'Senior Engineer', '1995-12-03', '9999-01-01'),
('4', '10004', 'Senior Engineer', '1995-12-03', '9999-01-01'),
('5', '10001', 'Senior Engineer', '1986-06-26', '9999-01-01'),
('6', '10002', 'Staff', '1996-08-03', '9999-01-01'),
('7', '10003', 'Senior Engineer', '1995-12-03', '9999-01-01');

答案

replace into titles_test values ('5', '10005', 'Senior Engineer', '1986-06-26', '9999-01-01')

题解

replace into检测主键或者唯一索引冲突,冲突则替换,否则退化成insert into操作

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