Finding and deleting duplicate values in a SQL table
Jul 28, 2019 · SELECT name, email, COUNT(*) FROM users GROUP BY name, email HAVING COUNT(*) > 1 Simply group on both of the columns. Note: the older ANSI standard is to have …
sql - Equivalent of a COUNTIF aggregate function - Stack Overflow
SELECT UID, COUNT(UID) AS TotalRecords, SUM(ContractDollars) AS ContractDollars, (COUNTIF(MyColumn, 1) / COUNT(UID) * 100) -- Get the average of all records that are 1 …
How to count occurrences of a column value efficiently in SQL?
How to count occurrences of a column value efficiently in SQL? Asked 16 years, 1 month ago Modified 1 year, 8 months ago Viewed 711k times
SQL to find the number of distinct values in a column
SELECT COUNT(DISTINCT column_name) AS some_alias FROM table_name This will count only the distinct values for that column.
How can I get multiple counts with one SQL query?
Why this might not be the best answer: always a full table scan. Consider a join of count-subqueries, or nested counts in a select. However with no indexes present, this might be best …
sql - Is it possible to specify condition in Count ()? - Stack Overflow
607 Is it possible to specify a condition in Count()? I would like to count only the rows that have, for example, "Manager" in the Position column.
sql - How to get count of CTE result? - Stack Overflow
Nov 9, 2016 · A CTE can hold temporary result set that is defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE. You cannot have another SELECT outside the …
sql - Multiple COUNT () for multiple conditions in one query …
Sep 27, 2013 · 1 I think this can also works for you select count(*) as anc,(select count(*) from Patient where sex='F')as patientF,(select count(*) from Patient where sex='M') as patientM …
sql - Counting DISTINCT over multiple columns - Stack Overflow
Sep 24, 2009 · If you are trying to improve performance, you could try creating a persisted computed column on either a hash or concatenated value of the two columns. Once it is …
sql - How can I use the COUNT clause without GROUPing? - Stack …
How can I get essentially the output of COUNT (*) (whatever's left after the where clause) without any grouping or need to aggregate all the columns? What I don't want to do is repeat each of …