Create a database
CREATE DATABASE name;
Show all databases
SHOW DATABASES;
Delete Database
DROP DATABASE name;
Select Database
USE DATABASENAME;
Display tables that exist in the current database
SHOW TABLES;
View table structure
DESCRIBE DATABASENAME;
Delete Data Sheet
DROP TABLE NAME (delete content and definition, free up space)
DELETE TABLE NAME (delete content without deleting the definition, not free up space)
All of the data look-up table
SELECT * FROM DATABASENAME;
Query condition (field number equal to 10)
SELECT * FROM DATABASENAME WHERE number=10;
Many conditions (field number equal to 10, the field is equal to class 2)
SELECT * FROM DATABASENAME WHERE number=10 AND class="2";
Ordering query results (ranked in descending order according to id)
SELECT * FROM DATABASENAME WHERE number=10 ORDER BY id DESC
Note: The default use the ORDER BY sort in ascending, descending you need to use DESC
United-table query
Union query, these table to figure out which field is to be queried intersection, you can query through the intersection of field
select * from Table A, Table B where Table A.XXX = Table B.XXX
Paging query
select * from table limit m, n (m-th data from the query to n pieces of data)