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Insert data: insert into table name (column name 1, column name 2.) values (value 1, value 2)

If you insert more than one piece of data, the insert into table name (column name 1, column name 2.) values (value 1, value 2), (value 1, value 2).

two。 Query data: select * from table name / / query all data in the table, where * can be changed to column name for detailed search

3. Update data: update table name set column name = new name where update condition

Example:

Change the mobile phone number with id 1 to the default "-": update students set tel=default where id=1

Increase the age of all by 1: update students set age=age+1

Change the name of the mobile phone number 13288097888 to "Zhang San" and the age to 19: update students set name= "Zhang San", age=19 where tel= "13288097888"

4. Delete data: the delete statement is used to delete data from a table. The basic usage is as follows:

Delete from table name where delete condition

Examples of use:

Delete the line with id 2: delete from students where id=3

Delete all data under the age of 21: delete from students where age

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