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Truncate table

Posted on 2011-02-21
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Last Modified: 2012-05-11
When you truncate a table does it automatically delete the child records or are the child's table FK consstraints disabled?
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Question by:msimons4
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slightwv (䄆 Netminder) earned 2000 total points
ID: 34947781
Give me a chance to answer in the other question.

Truncate will not work if child rows exist.

When in doubt, create two cables and try it.
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by:slightwv (䄆 Netminder)
ID: 34947803
Here's a quick a simple test to show all this in action.

drop table tab1 purge;
create table tab1(col1 char(1) primary key);

drop table tab2 purge;
create table tab2(col1 char(1), constraint tab2_fk foreign key(col1)
references tab1(col1) on delete cascade);

insert into tab1 values('a');
insert into tab2 values('a');
commit;

truncate table tab1;
delete from tab1;
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