CREATE TABLE emp(
eid INT,
ename VARCHAR(20),
egender CHAR(2),
ebirthday DATE,
eemail CHAR(10),
eramark VARCHAR(50)
);
/*增加age*/
ALTER TABLE emp ADD COLUMN eage CHAR(2);
/*查询所有*/
SELECT * FROM emp;
/*修改email'长度为50*/
ALTER TABLE emp MODIFY COLUMN eemail VARCHAR(50);
/*删除ramark*/
ALTER TABLE emp DROP COLUMN eramark;
/*列名name改为usename*/
ALTER TABLE emp CHANGE COLUMN ename eusename VARCHAR(2);
mysql 02
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转载自www.cnblogs.com/G-qz/p/10795730.html
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