Embedded database development programming (IV) -- DDL, DML

First enter sqlite3 file name

One 、 Create table

1. Create table syntax
   CREATE TABLE table_name(name1 type)
2. Field modifier

• primary key Define the primary key column
• AUTOINCREMENT Automatic growth
• UNIQUE Unique value for field
• NOT NULL The value of the field is not empty

Two 、 Delete table

DROP TABLE Table name

3、 ... and 、 Modify table

3.1 Add fields add

3.2 Delete field (mysql)

3.3 Modify fields modify and change(mysql)

1. change
   

2. modify
   

3.4 Specify where the added fields are displayed in the table (mysql)

3.5 Table rename

Four 、 Built in commands

.table： See if the table was created successfully
.schema： View the full information of the list

5、 ... and 、DML

sqlite3 No command in truncate table
Clear the table ： use delete from Table name