当前位置:网站首页>SQL advanced tutorial

SQL advanced tutorial

2022-06-26 09:44:00 Guobao

1、SQL Medium TOP( Used to specify the number of records to return ) Clause

2、SQL Medium LIKE The operator

3、SQL Wildcard in

4、SQL Medium IN The operator

5、SQL Medium BETWEEN The operator

6、SQL Medium Alias ( Alias )

7、SQL Medium JOIN ( Association table query )

8、SQL Medium INNER JOIN keyword

9、SQL Medium LEFT JOIN keyword

10、SQL Medium RIGHT JOIN keyword

11、SQL Medium FULL JOIN keyword

12、SQL Medium UNION and UNION ALL The operator

13、SQL Medium SELECT INTO( Create a backup attachment for a table ) sentence

14、SQL Medium CREATE DATABASE( Create database ) sentence

15、SQL Medium CREATE TABLE( Create tables in the database ) sentence

16、SQL Medium Constraints ( constraint )

17、SQL Medium NOT NULL  constraint

18、SQL Medium UNIQUE( Constraints uniquely identify each data in a database table ) constraint

19、SQL Medium PRIMARY KEY ( Used to constrain the unique identification of each record in the database table ) constraint

20、SQL Medium FOREIGN KEY( In a watch FOREIGN KEY Point to... In another table PRIMARY KEY) constraint

21、SQL Medium CHECK ( Constraints are used to limit the range of values in a column ) constraint

22、SQL Medium DEFAULT( The default value is ) constraint

23、SQL Medium CREATE INDEX( Create an index in a table ) sentence

24、SQL Medium DROP ( Delete index 、 Table or database ) sentence

25、SQL Medium ALTER TABLE( Used to add... To an existing table 、 Modify or delete columns ) sentence

26、SQL Medium AUTO INCREMENT( Generate a unique number when a new record is inserted into the table ) Field

27、SQL Medium VIEW( View )

28、SQL Medium Data ( date ) function

29、SQL Medium NULL value

30、SQL Medium ISNULL()、NVL()、IFNULL() and COALESCE() function

31、SQL data type

32、SQL The server

原网站

版权声明
本文为[Guobao]所创,转载请带上原文链接,感谢
https://yzsam.com/2022/177/202206260906012841.html