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SQL : Multiple Row and Column Subqueries – w3resource

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Multiple Row Subqueries

SQL Using IN operator with a Multiple Row Subquery

SQL Using NOT IN operator with a Multiple Row Subquery

SQL Using ANY with a Multiple Row Subquery

SQL Multiple Column Subqueries

SQL Subqueries using DISTINCT

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MySQL :: MySQL 8.0 Reference Manual :: 13.2.11.10 Subquery Errors

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Mysql sub query returns more than 1 row – Database Administrators Stack Exchange

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Need assistance with SQL query with error message subquery returns more than 1 row – CodeProject

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How can subquery return more than 1 row in MySQL? – Quick-Advisors.com

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About MySQL error: subquery returns more than 1 row | ProgrammerAH

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Select subquery error Subquery returns more than 1 row

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Solution to “subquery returns more than 1 row” error – Config Router

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Solution to “subquery returns more than 1 row” error

When one gets the error ‘sub-query returns more than 1 row’, the database is actually telling you that there is an unresolvable circular reference. It’s a bit like using a spreadsheet and saying cell A1 = B1 and then saying B1 = A1. This error is typically associated with a scenario where one needs to have a double nested sub-query. I would recommend you look up a thing called a ‘cross-tab query’ this is the type of query one normally needs to solve this problem. It’s basically an outer join (left or right) nested inside a sub-query or visa versa. One can also solve this problem with a double join (also considered to be a type of cross-tab query) such as below:

CREATE DEFINER=`root`@`localhost` PROCEDURE `SP_GET_VEHICLES_IN`( IN P_email VARCHAR(150), IN P_credentials VARCHAR(150) ) BEGIN DECLARE V_user_id INT(11); SET V_user_id = (SELECT user_id FROM users WHERE email = P_email AND credentials = P_credentials LIMIT 1); SELECT vehicles_in.vehicle_id, vehicles_in.make_id, vehicles_in.model_id, vehicles_in.model_year, vehicles_in.registration, vehicles_in.date_taken, make.make_label, model.model_label FROM make LEFT OUTER JOIN vehicles_in ON vehicles_in.make_id = make.make_id LEFT OUTER JOIN model ON model.make_id = make.make_id AND vehicles_in.model_id = model.model_id WHERE vehicles_in.user_id = V_user_id; END

In the code above notice that there are three tables in amongst the SELECT clause and these three tables show up after the FROM clause and after the two LEFT OUTER JOIN clauses, these three tables must be distinct amongst the FROM and LEFT OUTER JOIN clauses to be syntactically correct.

It is noteworthy that this is a very important construct to know as a developer especially if you’re writing periodical report queries and it’s probably the most important skill for any complex cross referencing, so all developers should study these constructs (cross-tab and double join).

Another thing I must warn about is: If you are going to use a cross-tab as a part of a working system and not just a periodical report, you must check the record count and reconfigure the join conditions until the minimum records are returned, otherwise large tables and cross-tabs can grind your server to a halt. Hope this helps.

What are single row and multiple row subqueries?

What are single row and multiple row subqueries?

Single Row Sub Query

A single-row subquery is used when the outer query’s results are based on a single, unknown value. Although this query type is formally called “single-row,” the name implies that the query returns multiple columns-but only one row of results. However, a single-row subquery can return only one row of results consisting of only one column to the outer query.

In the below SELECT query, inner MySQL returns only one row i.e. the minimum salary for the company. It, in turn, uses this value to compare the salary of all the employees and displays only those, whose salary is equal to minimum salary.

SELECT first_name, salary, department_id FROM employees WHERE salary = (SELECT MIN (salary) FROM employees);

A HAVING clause is used when the group results of a query need to be restricted based on some condition. If a subquery’s result must be compared with a group function, you must nest the inner query in the outer query’s HAVING clause.

SELECT department_id, MIN (salary) FROM employees GROUP BY department_id HAVING MIN (salary) < (SELECT AVG (salary) FROM employees) 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).While IN operator holds the same meaning as discussed in the earlier chapter, ANY operator compares a specified value to each value returned by the subquery while ALL compares a value to every value returned by a subquery. The below query will show the error because single-row subquery returns multiple rows. SELECT first_name, department_id FROM employees WHERE department_id = (SELECT department_id FROM employees WHERE LOCATION_ID = 100)

ORA-01427: Subquery returns more than one row

When you run a SQL Statement with Subquery, you can get ” ORA-01427: Subquery returns more than one row ” error.

ORA-01427 single-row subquery returns more than one row

Error details are as follows.

SELECT * FROM employee WHERE emp_id = (SELECT emp_id FROM person WHERE person_name = ‘Mehmet’) ;

ORA-01427 single-row subquery returns more than one row Cause: The outer query must use one of the keywords ANY, ALL, IN, or NOT IN to specify values to compare because the subquery returned more than one row. Action: Use ANY, ALL, IN, or NOT IN to specify which values to compare or reword the query so only one row is retrieved.

ORA-01427

This error ORA-01427: Subquery returns more than one row is related with the keywords ANY, ALL, IN, or NOT IN to specify values to compare because the subquery returned more than one row.

single-row subquery returns more than one row

If your SQL Statement ( single row subquery ) returns only one row, then you need to use the equal comparison operators (=,<,>,<> ).

But If your SQL Statement ( multiple row subquery ) returns more than one row ( multiple rows ), then you need to use the Multiple-row Sub-query Operators like ( IN, ANY, ALL and etc.. )

To solve the above SQL Statement, you can use the IN operator instead of = operator as follows.

SELECT * FROM employee WHERE emp_id IN (SELECT emp_id FROM person WHERE person_name = ‘Mehmet’) ;

This solution is valid for both Select and Update, Insert and Delete operations.

If you got this error during the Update, Insert and Delete operations, then Check your Statement if Subquery returns more than one row, then use the Multiple-row Sub-query Operators like ( IN, ANY, ALL and etc.. )

Do you want to learn more details about Oracle SQL, then read the following articles.

Oracle SQL Tutorials For Beginners – Learn Oracle SQL from scratch with Oracle SQL Online Course

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