SQLite Delete details and instance code, sqlitedelete

SQLite Delete details and instance code, sqlitedelete

SQLite Delete

SQLite's DELETE query is used to DELETE existing records in the table. You can use the DELETE query with the WHERE clause to DELETE selected rows. Otherwise, all records will be deleted.

Syntax

The basic syntax of a delete query with a WHERE clause is as follows:

DELETE FROM table_nameWHERE [condition];

You can use the and or operator to combine N conditions.

Instance

Assume that the COMPANY table has the following records:

ID     NAME    AGE     ADDRESS   SALARY---------- ---------- ---------- ---------- ----------1      Paul    32     California 20000.02      Allen    25     Texas    15000.03      Teddy    23     Norway   20000.04      Mark    25     Rich-Mond  65000.05      David    27     Texas    85000.06      Kim     22     South-Hall 45000.07      James    24     Houston   10000.0

The following is an instance that deletes the customer whose ID is 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 20000.02      Allen    25     Texas    15000.03      Teddy    23     Norway   20000.04      Mark    25     Rich-Mond  65000.05      David    27     Texas    85000.06      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. The DELETE query is as follows:

sqlite> DELETE FROM COMPANY;

Currently, the COMPANY table does not have any records because all records have been deleted using the DELETE statement.

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