SQL COUNT(DISTINCT multiple columns)、sql count重複、SQL COUNT GROUP BY在PTT/mobile01評價與討論，在ptt社群跟網路上大家這樣說
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SQL COUNT(DISTINCT multiple columns)在Counting DISTINCT over multiple columns - Stack Overflow的討論與評價
I believe a distinct count of the computed column would be equivalent to your ... SQL> select count(distinct concat(deptno,job)) from emp 2 ...
SQL COUNT(DISTINCT multiple columns)在How to count distinct values over multiple columns using SQL的討論與評價
How to count distinct values over multiple columns using SQL. Often we want to count the number of distinct items from this table but the ...
SQL COUNT(DISTINCT multiple columns)在COUNT DISTINCT for multiple columns - Oracle Communities的討論與評價
select count(distinct col1) from mytable; but when we want to count distinct column combinations, we must either clumsily concatenate values (and be very ...
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SQL COUNT(DISTINCT multiple columns)在SQL SELECT with DISTINCT on multiple columns - w3resource的討論與評價
SQL SELECT with DISTINCT on multiple columns: Multiple fields may also be added with DISTINCT clause. DISTINCT will eliminate those rows ...
SQL COUNT(DISTINCT multiple columns)在In SQL, how do I count DISTINCT over multiple columns?的討論與評價
select COUNT(if(colval='value1′, 1, NULL)) as value1_ct, · COUNT(if(colval='otherval', 1, NULL)) as otherval_ct, · COUNT(if(colval2='value2′,1, NULL)) as ...
SQL COUNT(DISTINCT multiple columns)在Count distinct on multiple columns #5281 - prestodb/presto的討論與評價
Hi there, In our system, queries like: SELECT COUNT(DISTINCT _col0, _col1, _col2) ..... are commonly used. Surely we can rewrite these to ...
SQL COUNT(DISTINCT multiple columns)在count of distinct | Teradata Downloads的討論與評價
How to get the count(combination of distinct values of two columns together). i am giving the query in the following wayselect count(distinct ...
SQL COUNT(DISTINCT multiple columns)在Select count distinct multiple columns sql server - Pretag的討論與評價
Select count distinct multiple columns sql server · 90%. Edit: Altered from the less-than-reliable checksum-only query I've discovered a way to ...
SQL COUNT(DISTINCT multiple columns)在COUNT(DISTINCT COL1,COL2) - MSDN的討論與評價
Is there any reason that sql doesnt support a distinct on 2 columns..i mean in the rdbms concept is it wrong.. That is by design.
SQL COUNT(DISTINCT multiple columns)在select count distinct on multiple columns Code Example的討論與評價
SELECT COUNT(DISTINCT (CHECKSUM(DocumentId,DocumentSessionId)) + CHECKSUM(REVERSE(DocumentId) ... select count distinct multiple columns sql server.