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I would like to embed a SELECT inside a COUNT, but I can't find any examples.
#pseudosql SELECT a AS current_a, COUNT(*) AS b, COUNT( SELECT FROM t WHERE a = current_a AND c = 'const' ) as d, from t group by a order by b desc 
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SQL SELECT statement can be used along with COUNT(*) function to count and display the data values. The COUNT(*) function represents the count of all rows present in the table (including the NULL and NON-NULL values).
In SQL, you can make a database query and use the COUNT function to get the number of rows for a particular group in the table. Here is the basic syntax: SELECT COUNT(column_name) FROM table_name; COUNT(column_name) will not include NULL values as part of the count.
SQL COUNT() with HAVING The HAVING clause with SQL COUNT() function can be used to set a condition with the select statement. The HAVING clause is used instead of WHERE clause with SQL COUNT() function.
SELECT count(*) as No_of_Column FROM information_schema. columns WHERE table_name ='geeksforgeeks'; Here, COUNT(*) counts the number of columns returned by the INFORMATION_SCHEMA . columns one by one and provides the final count of the columns.
You don't really need a sub-select:
SELECT a, COUNT(*) AS b, SUM( CASE WHEN c = 'const' THEN 1 ELSE 0 END ) as d, from t group by a order by b desc If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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