You can insert records in a table using data that are already stored in the database. This is only a copy of data and it doesn’t affect the origin table.
INSERT INTO SELECT statement combines
INSERT INTO and
SELECT statements and you can use any conditions you want. The syntax is:
INSERT INTO table2 (column1, column2, column3, ...) SELECT column1, column2, column3, ... FROM table1 WHERE condition;
Here is an example that inserts in the table Person all the male students from the table Students.
INSERT INTO Person(Id, Name, DateOfBirth, Gender) SELECT Id, Name, DateOfBirth, Gender FROM Students WHERE Gender = ‘M’