What is before and after trigger?
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How to execute OS(operating system) command from pl/sql?
Why truncate is faster than delete?
How can we avoid duplicating records in a query?
What are the key differences between SQL and PL SQL?
what is the difference between varray and table data type..please expalain with some examples... under what situation you will go for varray..instead of index by table...
list out some tools through which we can draw e-r diagrams for mysql. : Sql dba
Can sql developer connect to db2?
What is sql resultset?
What has stored procedures in sql and how we can use it?
How many types of primary keys are there?
What is not null in sql?
i have xml source. xml source having lacks of records. i want extract/retrive xml source data using sql query. please tell me how to write query.