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What is not a single-group group function?
ORA-00937: not a single-group group function Cause: A SELECT list cannot include both a group function, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, and an individual column expression, unless the individual column expression is included in a GROUP BY clause.
Which is not group function?
Which of the following is NOT a GROUP BY function? Answer: C. NVL is a general function used to provide alternate value to the NULL values. The functions MAX, MIN and AVG can be used as GROUP BY functions.
What is not a GROUP BY expression error in Oracle?
ORA-00979 “ Not a GROUP BY expression ” is an error issued by the Oracle database when the SELECT statement contains a column that is neither listed in GROUP BY nor aggregated.
What is Group function?
The GROUP BY Statement in SQL is used to arrange identical data into groups with the help of some functions. i.e if a particular column has same values in different rows then it will arrange these rows in a group. In the query, GROUP BY clause is placed before ORDER BY clause if used any.
Can a select list include a single group function?
Oracle docs note this about ORA-00937: ORA-00937 not a single-group group function Cause: A SELECT list cannot include both a group function, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, and an individual column expression, unless the individual column expression is included in a GROUP BY clause.
Why is my function missing the group by clause?
Answer: You are missing the GROUP BY clause in your function. Try to take the SQL out and run it in SQL*Plus until it works again. ORA-00937 can probably be detected during compile, but even if the function shows that it has been compiled, errors such as ORA-00937 may still be thrown.
When to use group by in a statement?
GROUP BY is used in conjunction with aggregate functions to filter the results by a value. The GROUP BY command can be very useful for viewing a select set of results. It is commonly used, which deems it essential to utilize the proper syntax when running the statement.
What is the last line of SQL not a single-group group function?
The last line is the group by clause that tells Oracle to count all rows with the same user_id and user_name combination. One of your comments states that you don’t want to include all the field present in a GROUP BY clause. @Arion posted a correlated-sub-query re-factor that gives the same values.