To determine which of the following options are not valid subquery types, we first must understand the definition and the types of subqueries generally recognized in SQL:

1. **Single Row Subquery:** This type of subquery returns a single row with one or more columns. It is typically used in a context where a single value is expected, such as in a comparison with a scalar value.

2. **Multiple Column Subquery:** This subquery can return multiple columns and a single row. It is often used in equality comparisons to match multiple columns in a parent query.

3. **Multiple Row Subquery:** This type returns multiple rows, which can include one or more columns. It is generally used with operators that handle multiple values, such as `IN`, `ANY`, or `ALL`.

4. **All are valid:** This option suggests that every mentioned type is valid among subquery types.

Based on the definitions above, all the types listed in the question are indeed valid subquery types. Hence, the answer deduced is as follows:

### Final Answer
None of the presented options are invalid; therefore, "All are valid" is the correct response.

Question

To determine which of the following options are not valid subquery types, we first must understand the definition and the types of subqueries generally recognized in SQL:

1. **Single Row Subquery:** This type of subquery returns a single row with one or more columns. It is typically used in a context where a single value is expected, such as in a comparison with a scalar value.

2. **Multiple Column Subquery:** This subquery can return multiple columns and a single row. It is often used in equality comparisons to match multiple columns in a parent query.

3. **Multiple Row Subquery:** This type returns multiple rows, which can include one or more columns. It is generally used with operators that handle multiple values, such as `IN`, `ANY`, or `ALL`.

4. **All are valid:** This option suggests that every mentioned type is valid among subquery types.

Based on the definitions above, all the types listed in the question are indeed valid subquery types. Hence, the answer deduced is as follows:

### Final Answer
None of the presented options are invalid; therefore, "All are valid" is the correct response.

Knowee AI · Accepted Answer

To determine which of the following options are not valid subquery types, we first must understand the definition and the types of subqueries generally recognized in SQL:

1. **Single Row Subquery:** This type of subquery returns a single row with one or more columns. It is typically used in a context where a single value is expected, such as in a comparison with a scalar value.

2. **Multiple Column Subquery:** This subquery can return multiple columns and a single row. It is often used in equality comparisons to match multiple columns in a parent query.

3. **Multiple Row Subquery:** This type returns multiple rows, which can include one or more columns. It is generally used with operators that handle multiple values, such as `IN`, `ANY`, or `ALL`.

4. **All are valid:** This option suggests that every mentioned type is valid among subquery types.

Based on the definitions above, all the types listed in the question are indeed valid subquery types. Hence, the answer deduced is as follows:

### Final Answer
None of the presented options are invalid; therefore, "All are valid" is the correct response.

Which of the following are not valid subquery type:Single row subqueryAll are validMultiple column subqueryMultiple row subquery

Question

Which of the following are not valid subquery type:

Solution

Final Answer

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