| How to select 1st record from the duplicate values in a table without using rownum and rowid [message #452737] |
Fri, 23 April 2010 13:05  |
meena.g
Messages: 14
Registered: February 2010
Location: Hyderabad (A.P)
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Junior Member |
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Hi,
how to select 1st record from duplicate vales in a table.
If we created one table with out primary key column
In form in search block have uwi value and top_depth value
when i enter uwi and top_depth value then when i click search button then it will display all values in master block.
but here duplicate values r there.
SQL> select rownum,uwi,top_depth,base_depth,test_start_date from well_pre_header;
ROWNUM UWI TOP_DEPTH BASE_DEPTH TEST_STAR
---------- ---------------- ---------- ---------- ---------
1 100 453.05 458.08 09-SEP-10
2 100 200 288 23-AUG-00
3 1001 200 289 25-AUG-01
4 1001 200 201 24-MAY-87
if uwi = 1001 and top_depth=200 and i will click search button it should be display 3 record & when i click next button then it will show 4th record.
please help me how to do solve that problem
[Topic title changed after dozen of topics have been merged. Applied [code] tags]
[Updated on: Fri, 23 April 2010 15:24] by Moderator Report message to a moderator |
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| Re: How to select 1st record from the duplicate values in a table without using rownum and rowid [message #452830 is a reply to message #452824] |
Sun, 25 April 2010 04:11  |
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Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe
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Senior Member
Account Moderator |
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Based on sample data you provided, querying (<Enter query>, enter 1001 into UWI item and 200 into TOP_DEPTH item, <Execute query>) will return all records that satisfy this condition:
ROWNUM UWI TOP_DEPTH BASE_DEPTH TEST_STAR
---------- ---------------- ---------- ---------- ---------
3 1001 200 289 25-AUG-01
4 1001 200 201 24-MAY-87As you want to display record 3 first and 4 after it, you'd put "ORDER BY BASE_DEPTH DESC" or "ORDER BY TEST_STAR DESC" into the ORDER BY block property. (Perhaps I'm wrong, but - as you didn't use ORDER BY in SELECT statement, I don't know how these records should be sorted - you know it, I believe).
Once you do that, <Next record> button (in Forms toolbar) (or key-down key on the keyboard or ...) will fetch the next record(s).
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