smallkun/class-notes
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smallkun 2025-02-21 11:35:03 +08:00
parent 124501634a
commit e65236340b
1 changed files with 10 additions and 3 deletions
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2208/天天乐学考试答案/MySQL练习（一）.md
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@ -27,7 +27,7 @@ REFERENCES 表名(字段) 字段是表中的主键
ALTER TABLE 表名 ADD CONSTRAINT 外键名 FOREIGN KEY(字段名) REFERENCES 表名(主键字段名); ALTER TABLE 表名 ADD CONSTRAINT 外键名 FOREIGN KEY(字段名) REFERENCES 表名(主键字段名);
ALTER TABLE t_employee ADD CONSTRAINT fK_did FOREIGN KEY(did) REFERENCES t_department(did); ALTER TABLE t_employee ADD CONSTRAINT fK_did FOREIGN KEY(did) REFERENCES t_department(did);
#4 排序、分页查询 #4 排序、分页查询 tj11
/* /*
基础查询 基础查询
SELECT 字段 SELECT 字段
@ -48,8 +48,15 @@ FROM t_employee
ORDER BY age DESC ORDER BY age DESC
LIMIT 5, 8;#第0个代表第一个 第六个使用的位置是5 LIMIT 5, 8;#第0个代表第一个 第六个使用的位置是5
#5条件查询 tj12
#5 /*
SELECT 字段
FROM 表
WHERE 条件;
*/
SELECT *
FROM t_salary
WHERE money >= 5000 AND money <= 8000;
#6 #6