i.                   
To
verify whether the patch has been already applied query for the patch number in
ad_applied_patches as follows,
select
APPLIED_PATCH_ID, PATCH_NAME, PATCH_TYPE, CREATION_DATE from ad_applied_patches
where patch_name=’patch_number;
ii.                 
Or
check for the the patch number in ad_bugs as follows,
select
APPLIED_PATCH_ID, PATCH_NAME, PATCH_TYPE, CREATION_DATE from ad_applied_patches
where patch_name=’patch_number;
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