How do I fix Ora-01427 single row subquery returns more than one row in SELECT?
The Solution This brings us to our solution for the ORA-01427 error. There are essentially two options to take. The first is to rewrite the query so that the subquery will only return a single row, thus eliminating the source of the error.
What operator is used to prevent the error ORA-01427 single row subquery returns more than one row?
IN operator is used to prevent the error: ‘ORA-01427:single row sub query returns more than one row’. IN operator is used to specify which values to compare or reword the query so only one row is retrieved.
What if subquery returns more than one row?
Multiple Row Sub Query Multiple-row subqueries are nested queries that can return more than one row of results to the parent query. Multiple-row subqueries are used most commonly in WHERE and HAVING clauses. Since it returns multiple rows, it must be handled by set comparison operators (IN, ALL, ANY).
How do I stop subquery returns more than one row?
Show activity on this post. = can be used when the subquery returns only 1 value. For this example, make sure your “multiple row query” returns just one column. Something like SELECT ID FROM FOO will work, whereas SELECT ID, NAME FROM FOO or SELECT * FROM FOO won’t.
How do you handle subquery returning more than one value?
You may use the IN, ANY, or ALL operator in outer query to handle a subquery that returns multiple rows. Contents: Using IN operator with a Multiple Row Subquery. Using NOT IN operator with a Multiple Row Subquery.
How do you update multiple records in SQL?
There are a couple of ways to do it. INSERT INTO students (id, score1, score2) VALUES (1, 5, 8), (2, 10, 8), (3, 8, 3), (4, 10, 7) ON DUPLICATE KEY UPDATE score1 = VALUES(score1), score2 = VALUES(score2);
How can a subquery return more than one value?
A row subquery is a subquery variant that returns one or more rows and can thus return more than one column value. When the subquery returns one or more rows of values, the subquery is only evaluated once and then the row(s) of values is returned to outer query to use.
Which operator can be used in multiple row subqueries?
Answer: D. Multiple-row subqueries return more than one row of results. Operators that can be used with multiple-row subqueries include IN, ALL, ANY, and EXISTS.
How do you resolve subquery returned more than one value?
Some ideas:
- Fix the data such that the existing subquery returns only 1 record.
- Fix the subquery such that it only returns one record.
- Add a top 1 and order by to the subquery (nasty solution that DBAs hate – but it “works”)
- Use a user defined function to concatenate the results of the subquery into a single string.
What is single row subquery and multiple row subquery?
Subqueries that can return only one or zero rows to the outer statement are called single-row subqueries. Subqueries that can return more than one row (but only one column) to the outer statement are called multiple-row subqueries. Multiple-row subqueries are subqueries used with an IN, ANY, or ALL clause.
What is single row subquery and multiple-row subquery?
Which operator helps to all the value returned by the subquery?
When all is used with < or > in a subquery, it returns results when all values retrieved in the subquery match the value in the where or having clause of the outer statement. Using the > comparison operator as an example: > all means greater than every value, or greater than the maximum value.