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Developer-C 11.1
3.0
4.0
10.2
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10.6
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10.9
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5.5
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11g Release 2
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17
2012
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3.27
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CREATE TABLE t (ID int, Column1 varchar(1), Column2 varchar(1), Column3 varchar(4)) ; INSERT INTO t (ID, Column1, Column2, Column3) VALUES (1, 'A', 'B', 'C'), (2, 'A', 'A', 'B'), (3, 'A', 'A', NULL) ;
3 rows affected
select * from t cross apply (select count(distinct cnt) as unique_count from (values(Column1),(Column2),(Column3)) t(cnt)) t2
ID
Column1
Column2
Column3
unique_count
1
A
B
C
3
2
A
A
B
2
3
A
A
null
1
Warning: Null value is eliminated by an aggregate or other SET operation.