Welcome to MySQL Workbench:UPDATE更新

UPDATE更新：

如果我们需要修改或更新 MySQL 中的数据，我们可以使用 SQL UPDATE 命令来操作。

CREATE TABLE test_NO1(
test_NO1_id INT NOT NULL AUTO_INCREMENT,
test_NO1_title VARCHAR(100) NOT NULL,
test_NO1_author VARCHAR(40) NOT NULL,
test_NO1_date DATE,
PRIMARY KEY ( test_NO1_id )
)ENGINE=InnoDB;

drop table test_no1;


INSERT INTO test_NO1 
    (test_NO1_title, test_NO1_author, test_NO1_date )
    VALUES
    ("programb", "welcome to programb", NOW());
    
    
select * from test_NO1;


INSERT INTO test_NO1 
    (test_NO1_title, test_NO1_author, test_NO1_date )
    VALUES
    ("programb2", "welcome to programb2", NOW());
    
INSERT INTO test_NO1 
    (test_NO1_title, test_NO1_author, test_NO1_date )
    VALUES
    ("programb3", "welcome to programb3", NOW());
    
    

SELECT * from test_NO1  WHERE test_NO1_title='programb2';

SELECT * from test_NO1;

update test_NO1 SET test_NO1_title='programb100' WHERE test_NO1_id=1;

SELECT * from test_NO1 where test_NO1_id=1;

update test_NO1 SET test_NO1_title='programb100' WHERE test_NO1_id=1;

SELECT * from test_NO1 where test_NO1_id=1;

update test_NO1 SET test_NO1_title='programb100' WHERE test_NO1_id=1;