Check all the duplicate values in the column COUNT()

Hello

I'll do some tests, and for this I need to retrieve data based on a single column for example test_data_col, which-
1 to 3 or more count (test_data_col) for a given set of columns for example grp_col1, grp_col2, grp_col3 group
2. overall recovered lines, this particular column has some duplicate values. I don't need displayed duplicates, just whether or not duplicates exist.

Which could explain what I'm trying to do -

grp_col1, grp_col2, grp_col3, test_data_col

1, A, xyz, HELLO
1, A, xyz, HELLO
1, a, xyz, BYE
1, A, xyz, goodbye

2, C, pqr, WELCOME
2, C, pqr, GOOD MORNING
2, C, pqr, BAD MORNING

So for condition 1, I do something like that.
SELECT COUNT(test_data_col) cnt, grp_col_1, grp_col2, grp_col3
FROM test_tab
GROUP BY grp_col_1, grp_col2, grp_col3
HAVING COUNT(test_data_col) >= 3;
In this request, I want to do something that will tell me if the aggregate COUNT (test_data_col) has all the duplicate values it contains. Yet once, display the duplicates is not important here.
SELECT COUNT(test_data_col) cnt, grp_col_1, grp_col2, grp_col3,
/*some logic*/ dup_val
FROM test_tab
GROUP BY grp_col_1, grp_col2, grp_col3
HAVING COUNT(test_data_col) >= 3;
With the correct to replace coding / * some * logic /, I have following values.

CNT, grp_col_1, grp_col2, grp_col3, dup_val

4, 1, a, xyz, Y
3, 2, C, pqr, N

I have dup_val column to explain what I'm trying to achieve... Another way to know the existence of duplicates in the aggregate count will be fine.

My version of Oracle's Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0

Do you like the answer!

Your somewhere logical can be like that

case when COUNT(test_data_col) != COUNT(distinct test_data_col) the 'Y' else 'N' end dup_val

Tags: Database

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