What do you do when a subquery returns more than one row?

By Lexie Tanner 4 years ago

What do you do when a subquery returns more than one row?

Multiple Row Subqueries You may use the IN, ANY, or ALL operator in outer query to handle a subquery that returns multiple rows.

Can a subquery return more than one row?

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 you resolve ORA 01427 single row subquery returns more than one row?

Dmytro offered this advice to resolve ORA-01427: Try to add and rownum=1 to your subquery conditions if you DO NOT care about the value from the list or DO sure that they are the same. A single row subquery returns only one row. It can be used with the equal comparison operators (=,<,>,<>, etc).

How can I insert multiple rows from one table to another in MySQL?

MySQL Insert Multiple Rows

  1. First, specify the name of table that you want to insert after the INSERT INTO keywords.
  2. Second, specify a comma-separated column list inside parentheses after the table name.
  3. Third, specify a comma-separated list of row data in the VALUES clause. Each element of the list represents a row.

What happens if a single row subquery returns more than one row of results?

The cause of the error is a subquery returning more than one row of information. This error in multi-row returns on the subquery originates from an outer query failing to use appropriate, designated keywords to specify values for comparison in the subquery.

What happens when a scalar subquery returns more than one value?

A scalar subquery expression is a subquery that returns exactly one column value from one row. If the subquery returns 0 rows, then the value of the scalar subquery expression is NULL . If the subquery returns more than one row, then Oracle returns an error.

Can a subquery return multiple columns?

SQL: Multiple Column Subqueries You can write subqueries that return multiple columns. The following example retrieves the order amount with the lowest price, group by agent code.

How do I have multiple rows in one row in SQL?

STUFF Function in SQL Server

  1. Create a database.
  2. Create 2 tables as in the following.
  3. Execute this SQL Query to get the student courseIds separated by a comma. USE StudentCourseDB. SELECT StudentID, CourseIDs=STUFF. ( ( SELECT DISTINCT ‘, ‘ + CAST(CourseID AS VARCHAR(MAX)) FROM StudentCourses t2.

How do I fix single row subquery returns more than one row in Oracle?

Using IN Operator In practice, SELECT should use IN operator instead of = (equal operator) in order to accommodate more than one row returned by the subquery. SQL> select * from employees where department_id in (select department_id from departments where location_id = 1700);

How do I stop subquery returns more than one row?

= 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 I insert multiple rows from one table to another in SQL?

The INSERT statement also allows you to insert multiple rows into a table using a single statement as the following: INSERT INTO table_name(column1,column2…) VALUES (value1,value2,…), (value1,value2,…), … In this form, you need to provide multiple lists of values, each list is separated by a comma.

How do I insert unique records from one table to another?

Insert Distinct Column Value From One Table to Another Table in…

  1. INSERT INTO Manager(ManagerName)
  2. SELECT DISTINCT ManagerName.
  3. FROM Employee.
  4. WHERE ManagerName NOT IN(SELECT ManagerName FROM Manager);

How many rows does MySQL sub query return?

Mysql sub query returns more than 1 row Ask Question Asked9 years ago Active1 year, 6 months ago Viewed29k times 5 1

What does it mean to insert a row into a table in MySQL?

It means that one row has been inserted into the tasks table successfully. In this example, we specified the values for only title and priority columns. For other columns, MySQL uses the default values. The task_id column is an AUTO_INCREMENT column. It means that MySQL generates a sequential integer whenever a row is inserted into the table.

Which is the auto increment column in MySQL?

The task_id column is an AUTO_INCREMENT column. It means that MySQL generates a sequential integer whenever a row is inserted into the table. The start_date, due_date, and description columns use NULL as the default value, therefore, MySQL uses NULL to insert into these columns if you don’t specify their values in the INSERT statement.

How to insert a date into a table in MySQL?

MySQL uses the number 3 to insert into the priority column. The following statement returns the contents of the tasks table after the insert: To insert a literal date value into a column, you use the following format: YYYY represents a four-digit year e.g., 2018. MM represents a two-digit month e.g., 01, 02, and 12.