sql multiple subqueries in (select statement)

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Today, We want to share with you sql subquery.In this post we will show you sql update multiple columns, hear for joins sql we will give you demo and example for implement.In this post, we will learn about left join vs left outer join with an example.

SQL Subquery, IN SELECT – with Examples

There are the Following The simple About sql multiple subqueries in (select statement) Full Information With Example and source code.

As I will cover this Post with live Working example to develop sql subquery, so the sql subquery as variable is used for this example is following below.

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What is subquery in SQL?

A subquery is a SQL query within a query.
They are nested queries that provide data to the enclosing query.

Subqueries can return individual values or a list of rows.
Note: that subquery statements are enclosed between parenthesis.

The SQL subquery syntax

There is no general syntax; subqueries are regular queries placed inside parenthesis.
Subqueries can be used in different ways and at different locations inside a query:

Here is a subquery with the IN operator.

SELECT datacolumns
  FROM dbtable-nm1
 WHERE value IN (SELECT datacolumn
                   FROM dbtable-nm2 
                  WHERE condition)

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Subqueries can also assign column values for each row:

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SELECT column1 = (SELECT datacolumn FROM dbtable-nm WHERE condition),
       datacolumns
  FROM dbtable-nm
 WEHRE condition

SQL Subquery Examples

SQL Query Question: List items with order total_qty greater than 100.

SELECT ProductName
  FROM Product 
 WHERE Id IN (SELECT ProductId 
                FROM TransactionItem
               WHERE Quantity > 100)

SQL Subquery Examples

SQL Query Question: List all members with their total number of Transactions

SELECT MemberName, ProfileName, 
       TransactionCount = (SELECT COUNT(O.Id) 
                       FROM [Transaction] O 
                      WHERE O.MemberId = C.Id)
  FROM Member C 

This is a correlated subquery because the subquery references the enclosing query (i.e. the C.Id in the WHERE clause).

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