Answer / tulsi

The main use of ON DELETE CASCADE is to delete the child
records automatically from a table when the related records
from master table is deleted.

Assign the ON DELETE CASCADE clause while creating the
foreign key

Answer / vilas

Yes,its true and won't display any error while deleting the
master table.

Answer / ansupriya

If child record exists user cannot delete parent record.
Using on delete cascade on foreign constraint user can delete parent record .
Same time automatically it will delete the child record.

how to delete duplicate rows from a join tables(I have three tables on that join) how do you know which join is need to be used? The select statement I have is: SELECT gc_skill_type.skill_type, gc_area_tec.area, gc_technology.technology, gc_technology.id_technology, gc_area_tec.id_area_tec FROM gc_skill_type, gc_area_tec, gc_technology WHERE gc_area_tec.id_skill_type (+) = gc_skill_type.id_skill_type AND gc_technology.id_area_tec (+) = gc_area_tec.id_area_tec order by gc_skill_type.skill_type asc, gc_area_tec.area asc, gc_technology.technology asc

1 Answers   IAS,

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Write one update command to update seqno field of a table on the basis of row number.

4 Answers   HCL,

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How packaged procedures and functions are called from the following?

2 Answers  

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1 Answers   Polaris,

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Give the structure of the procedure ?

1 Answers  

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0 Answers  

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Explain what is table in a database?

0 Answers  

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0 Answers  

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3 Answers   HCL,

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5 Answers   Ramco, Satyam,

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How do you remove duplicates without using distinct in sql?

0 Answers  

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