SQL指令 2 SELECT 2 DISTINCT 3 WHERE 4 AND OR 5 IN 5 BETWEEN 6 LIKE 7 ORDER BY 8 函数 10 COUNT 11 GROUP BY 12 HAVING 13 ALIAS 13 表格链接 15 外部链接 16 CONCATENATE 17 SUBSTRING 18 TRIM 19 表格处理 21 CREATE TABLE 21 CONSTRAINT 22 NOT NULL 22 UNIQUE 22 CHECK 23 主键 23 外来键 24 CREATE VIEW 26 CREATE INDEX 28 ALTER TABLE