DELETE

DELETE operator is used to delete enties. It is commonly used together with WHERE operator.

For example, switch table is:

new_db.db> SELECT * from switch;
+----------------+----------+------------+-------------------+------------+-----------+
| mac            | hostname | model      | location          | mngmt_ip   | mngmt_vid |
+----------------+----------+------------+-------------------+------------+-----------+
| 0010.D1DD.E1EE | sw1      | Cisco 3850 | London, Green Str | 10.255.1.1 | 255       |
| 0020.A2AA.C2CC | sw2      | Cisco 3850 | London, Green Str | 10.255.1.2 | 255       |
| 0040.A4AA.C2CC | sw4      | Cisco 3850 | London, Green Str | 10.255.1.4 | 255       |
| 0050.A5AA.C3CC | sw5      | Cisco 3850 | London, Green Str | 10.255.1.5 | 255       |
| 0060.A6AA.C4CC | sw6      | C3750      | London, Green Str | 10.255.1.6 | 255       |
| 0070.A7AA.C5CC | sw7      | Cisco 3650 | London, Green Str | 10.255.1.7 | 255       |
| 0030.A3AA.C1CC | sw3      | Cisco 3850 | London, Green Str | 10.255.1.3 | 255       |
| 0080.A8AA.C8CC | sw8      | Cisco 3850 | London, Green Str | 10.255.1.8 | 255       |
+----------------+----------+------------+-------------------+------------+-----------+
8 rows in set
Time: 0.033s

Deleting information about sw8 switch is performed as follows:

new_db.db> DELETE from switch where hostname = 'sw8';
You're about to run a destructive command.
Do you want to proceed? (y/n): y
Your call!
Query OK, 1 row affected
Time: 0.008s

No line with sw8 switch in the table now:

new_db.db> SELECT * from switch;
+----------------+----------+------------+-------------------+------------+-----------+
| mac            | hostname | model      | location          | mngmt_ip   | mngmt_vid |
+----------------+----------+------------+-------------------+------------+-----------+
| 0010.D1DD.E1EE | sw1      | Cisco 3850 | London, Green Str | 10.255.1.1 | 255       |
| 0020.A2AA.C2CC | sw2      | Cisco 3850 | London, Green Str | 10.255.1.2 | 255       |
| 0040.A4AA.C2CC | sw4      | Cisco 3850 | London, Green Str | 10.255.1.4 | 255       |
| 0050.A5AA.C3CC | sw5      | Cisco 3850 | London, Green Str | 10.255.1.5 | 255       |
| 0060.A6AA.C4CC | sw6      | C3750      | London, Green Str | 10.255.1.6 | 255       |
| 0070.A7AA.C5CC | sw7      | Cisco 3650 | London, Green Str | 10.255.1.7 | 255       |
| 0030.A3AA.C1CC | sw3      | Cisco 3850 | London, Green Str | 10.255.1.3 | 255       |
+----------------+----------+------------+-------------------+------------+-----------+
7 rows in set
Time: 0.039s