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-- 创建表 CREATE TABLE xs1 ( Id INT PRIMARY KEY NOT NULL, Sname VARCHAR(32) ); -- 插入数据 INSERT INTO xs1 (Id, Sname) VALUES (1, '张三'), (2, 'lisi'), (3, '王五'); -- 创建视图 CREATE VIEW vxs AS SELECT * FROM xs1; -- 创建索引 CREATE INDEX xind ON xs1(Id, Sname); -- 查看索引（MySQL语法） SHOW INDEX FROM xs1; -- 重命名索引（MySQL语法） ALTER TABLE xs1 RENAME INDEX xind TO xindex; -- 删除索引（MySQL语法） ALTER TABLE xs1 DROP INDEX xindex;

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