Getting started with SQL

One , brief introduction

Two , grammar

1, Database table

2,SQL sentence

3、 ... and ,SELECT sentence

Four ,SELECT DISTINCT sentence

5、 ... and ,WHERE Clause

6、 ... and ,AND & OR Operator

7、 ... and ,ORDER BY keyword

8、 ... and ,INSERT INTO sentence

Nine ,UPDATE sentence

Ten ,DELETE sentence

11、 ... and ,SELECT TOP, LIMIT, ROWNUM Clause

Twelve ,LIKE The operator

13、 ... and , wildcard

1, Use SQL % wildcard

2, Use SQL _ wildcard

3, Use SQL [charlist] wildcard

fourteen ,IN The operator

15、 ... and ,BETWEEN The operator

1,BETWEEN Operator instance

2,NOT BETWEEN Operator instance

3, with IN Of BETWEEN Operator instance

4, With text values BETWEEN Operator instance

5, With text values NOT BETWEEN Operator instance

6, With date values BETWEEN Operator instance

sixteen , Alias

1, Alias instance of the column

2, Alias instance of the table

seventeen , Connect (JOIN)

1,INNER JOIN

2,LEFT JOIN

3, RIGHT JOIN

4,FULL OUTER JOIN

eighteen ,UNION The operator

nineteen ,SELECT INTO

twenty ,INSERT INTO SELECT

The 21st ,CREATE DATABASE

Twenty-two ,CREATE TABLE

23 , constraint

1,NOT NULL

2,UNIQUE

3,PRIMARY KEY

4,FOREIGN KEY

5,CHECK

6,DEFAULT

Twenty-four ,CREATE INDEX

twenty-five ,DROP

hexacosa- ,ALTER TABLE

twenty-seven , AUTO INCREMENT

Twenty-eight , View （Views）

Twenty-nine ,Date function

thirty ,NULL

Thirty-one , Common data types

Thirty-two , Data types for various databases

See ：
https://www.runoob.com/sql/sql-datatypes.html