How to get a separate account of several columns
I've done this before and I'll darn why I don't remember this.A table with 3 columns with the primary key defined in the column.
Line a, b and c
NUM.
1 020 how abc
2 why 030 def
3 010 no IGS
4 how 040 abc
Yes def 5 050
6 060 why def
So what I want is a number of unique values to columns b and c as if b and c were in fact a field.
So the result of the query:
Count = 4 unique lines.
I hope I make some kind of sense. It is a bit much to know if the number of occurrences of each duplicate value, I know not just get the number of unique lines of lines not indexed will be enough. Because the query is supposed to be universal for several digital and alphanumeric data columns and can be extended for several columns, I'm just trying to get a basic skeleton which works for an analysis "on the fly".
It will be useful.
SQL>create table rb as select rownum A, rownum b , rownum c from dual connect by level < 11;
Table created.
Elapsed: 00:00:00.31
SQL>select count(distinct a) from Rb
2 union all
3 select count(distinct B ) from Rb
4 union all
5 select count(distinct c) from Rb
6 /
COUNT(DISTINCTA)
----------------
10
10
10
Elapsed: 00:00:00.53
SQL>update rb set b = 3 where B > 5;
5 rows updated.
Elapsed: 00:00:00.26
SQL>commit;
Commit complete.
Elapsed: 00:00:00.26
SQL>select count(distinct a) from Rb
2 union all
3 select count(distinct B ) from Rb
4 union all
5 select count(distinct c) from Rb
6 /
COUNT(DISTINCTA)
----------------
10
5
10
Elapsed: 00:00:00.53
SQL>
Tags: Database
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