What if subquery returns more than 1 row?

What if subquery returns more than 1 row?

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.

Can subquery return more than one value?

A subquery that returns one or more rows of values is also known as row subquery. A row subquery is a subquery variant that returns one or more rows and can thus return more than one column value.

How do I SELECT multiple rows in SQL query?

SELECT * FROM users WHERE ( id IN (1,2,..,n) ); or, if you wish to limit to a list of records between id 20 and id 40, then you can easily write: SELECT * FROM users WHERE ( ( id >= 20 ) AND ( id <= 40 ) );

What are multi row subquery operators?

Answer: B. 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. The multi row operators IN, ANY, ALL must be used with single row operators as shown in the option B.

Can we use multi row operator in single row subquery?

A multiple-row subquery returns more than one row of data. The operators used in a single-row subqueries relational operators (=, <>, >, >=, <, <=) cannot be used in multiple-row subqueries. Instead, other operators must be used.

How do I fix my ORA 01427?

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).

What is a multi column subquery?

Multiple-column subqueries enable you to combine duplicate WHERE conditions into a single WHERE clause. Column comparisons in a multiple-column subquery can be pairwise comparisons or nonpairwise comparisons. You can use a subquery to define a table to be operated on by a containing query.

Which operator can be used in multiple row subqueries?

Answer: B. 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.

Can we use multi-row operator in single-row subquery?

What are multi-row functions in SQL?

The multi-row function in SQL is used to retrieve data per set of rows at the time when we work on the group by clause we use the Multi-Row Function.

When to use subqueries?

A Subquery or Inner query or a Nested query is a query within another SQL query and embedded within the WHERE clause. A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved.

What is the difference between a join and subquery?

Joins are used in the FROM clause of the WHERE statement; however, you’ll find subqueries used in most clauses such as the: SELECT List – here a subqueries used to return single values are used. WHERE clause – depending on the conditional operator you’ll see single value or row based subqueries. FROM clause – It is typical to see row based result subqueries used here. HAVING clause – In my experience scalar (single value) subqueries are used here.

What is sub in SQL?

SQL Sub queries are the queries which are embedded inside another query. The embedded queries are called as INNER query & container query is called as OUTER query. The subqueries are the queries which are executed inside of another query. The result SQL query totally depends on the result of a subquery.

What is a SELECT query in SQL?

SQL – SELECT Query. The SQL SELECT statement is used to fetch the data from a database table which returns this data in the form of a result table. These result tables are called result-sets.