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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
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