SQL select query statement collection (single table query, multi-table join query)

Usage of select query statement (including data query and linked table query)

Environment: centos7, mysql version as shown in the figure below:

The following experimental examples are based on a student table student and a grade table score. The following are the structures and table data of the two tables:
1. student

2. score


1. Single table query

• Query all fields; select * from table name;

mysql> select * from student;
+-----+-----------+----