A, IN operator basic usage
IN operator for a predetermined plurality of values in the WHERE clause.
Syntax is as follows:
SELECT 1 column names, column names, table 2 the FROM ... WHERE column name IN (value 1, value 2, ...);
Example student table:
example:
SELECT * FROM student WHERE student_number IN(20190100,20190103);
operation result:
Of course, you can use the NOT keyword to find the data in the value is not specified:
SELECT * FROM student WHERE student_number NOT IN(20190100,20190103);
operation result:
