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## How do I INTERSECT two columns in SQL?

The INTERSECT operator is used to combine like rows from two queries. It returns rows that are in common between both results. To use the INTERSECT operator, **both queries must return the same number of columns** and those columns must be of compatible data types.

## What do the INTERSECT and minus clauses do?

SQL INTERSECT and MINUS are useful clauses for **quickly finding the difference between two tables and finding the rows they share**. INTERSECT compares the data between tables and returns only the rows of data that exist in both tables.

## What is the use of INTERSECT in SQL?

The INTERSECT clause in SQL is used to **combine two SELECT statements** but the dataset returned by the INTERSECT statement will be the intersection of the data-sets of the two SELECT statements. In simple words, the INTERSECT statement will return only those rows which will be common to both of the SELECT statements.

## What is difference between inner join and INTERSECT?

They are very different, even in your case. The **INNER JOIN will return duplicates**, if id is duplicated in either table. INTERSECT removes duplicates. The INNER JOIN will never return NULL , but INTERSECT will return NULL .

## Which SQL keyword is used to retrieve a maximum value?

**MAX()** is the SQL keyword is used to retrieve the maximum value in the selected column.

## How can we insert data into a view?

You can insert rows into **a view only if the view is modifiable and contains no derived columns**. The reason for the second restriction is that an inserted row must provide values for all columns, but the database server cannot tell how to distribute an inserted value through an expression.

## What is the difference between minus and INTERSECT?

INTERSECT gives you the rows that are found in both queries by eliminating rows that are only found in one or the other query. MINUS gives you the rows that are found in the **first** query and not in the second query by removing from the results all the rows that are found only in the second query.

## What is difference between intersect and union in SQL?

UNION: Combine two or more result sets into a single set, without duplicates. … INTERSECT: Takes the **data from both result sets which are in common**. EXCEPT: Takes the data from the first result set, but not in the second result set (i.e. no matching to each other)

## Which of the following is true for a primary key?

Primary keys **must contain unique values**. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.

## Which operator is used to find common values in set?

**The SQL intersect operator** allows us to get common values between two tables or views. The following graphic shows what the intersect does. The set theory clearly explains what an intersect does. In mathematics, the intersection of A and B (A ∩ B) is the set that contains all elements of A that also belong to B.

## What is true about INTERSECT operator?

What is true about the INTERSECT operator? Answer: C. **INTERSECT Returns only the rows that occur in both queries’ result sets, sorting them and removing duplicates**.