May 16, 2021 SQLite
SQLite's DELETE query is used to delete records that are already in the table. You can use the DELETE query with the WHERE clause to delete the selected row, otherwise all records will be deleted.
The basic syntax of a DELETE query with a WHERE clause is as follows:
DELETE FROM table_name WHERE [condition];
You can use the AND or OR operator to combine N conditions.
Suppose the COMPANY table has the following records:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 1 Paul 32 California 20000.0 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0 7 James 24 Houston 10000.0
Here's an instance that removes a customer with an ID of 7:
sqlite> DELETE FROM COMPANY WHERE ID = 7;
The COMPANY table now has the following records:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 1 Paul 32 California 20000.0 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0
If you want to delete all records from the COMPANY table, you do not need to use the WHERE clause, and the DELETE query is as follows:
sqlite> DELETE FROM COMPANY;
There are now no records in the COMPANY table because all records have been deleted through the DELETE statement.