Can I use distinct in HAVING clause?
Can I use distinct in HAVING clause?
You can use the HAVING clause to place conditions on the GROUP BY column values as well as on calculated values. The condition in the HAVING clause cannot include a DISTINCT or UNIQUE aggregate expression.
How do I count distinct queries in SQL?
The correct syntax for using COUNT(DISTINCT) is: SELECT COUNT(DISTINCT Column1) FROM Table; The distinct count will be based off the column in parenthesis. The result set should only be one row, an integer/number of the column you’re counting distinct values of.
What is the difference between distinct count and count distinct?
Count would show a result of all records while count distinct will result in showing only distinct count. For instance, a table has 5 records as a,a,b,b,c then Count is 5 while Count distinct is 3.
Is there any difference between group by and distinct?
There is no significantly difference between group by and distinct clause except the usage of aggregate functions. Both can be used to distinguish the values but if in performance point of view group by is better.
How do you count distinct values in SQL?
SQL COUNT(*) The purpose of SQL COUNT(*) is to count the number of lines returned by the SQL query. To count the number of rows in the revenues table, we use the following statement: select count(*) from revenues. You can put the keyword distinct followed by a column name inside the parenthesis instead of a star.
How do you use group by SQL?
The SQL GROUP BY clause is used in collaboration with the SELECT statement to arrange identical data into groups. This GROUP BY clause follows the WHERE clause in a SELECT statement and precedes the ORDER BY clause.
What does group by function actually does in SQL?
The GROUP BY Clause SQL is used to group rows with same values.
