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Delete Record command is used to delete one or more records completely from the database.
The following statement is the basic syntax of the Delete command.
DELETE FROM <Class>|cluster:<cluster>|index:<index> [LOCK <default|record>] [RETURN <returning>] [WHERE <Condition>*] [LIMIT <MaxRecords>] [TIMEOUT <timeout>]
Following are the details about the options in the above syntax.
LOCK − Specifies how to lock the records between load and update. We have two options to specify Default and Record.
RETURN − Specifies an expression to return instead of the number of records.
LIMIT − Defines the maximum number of records to update.
TIMEOUT − Defines the time you want to allow the update run before it times out.
Note − Don’t use DELETE to remove Vertices or Edges because it effects the integrity of the graph.
Example
Let us consider the Customer table.
Sr.No. | Name | Age |
---|---|---|
1 | Satish | 25 |
2 | Krishna | 26 |
3 | Kiran | 29 |
4 | Javeed | 21 |
Try the following query to delete the record having id = 4.
orientdb {db = demo}> DELETE FROM Customer WHERE id = 4
If the above query is executed successfully, you will get the following output.
Delete 1 record(s) in 0.008000 sec(s).
To check the record of Customer table you can use the following query.
Orientdb {db = demo}> SELECT FROM Customer
If the above query is executed successfully, you will get the following output.
----+-----+--------+----+-------+---- # |@RID |@CLASS |id |name |age ----+-----+--------+----+-------+---- 0 |#11:0|Customer|1 |satish |25 1 |#11:1|Customer|2 |krishna|26 2 |#11:2|Customer|3 |kiran |29 ----+-----+--------+----+-------+----
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