SQL Subquery, also known as inner queries or nested queries, are used to query data from one or more tables and then used in another SQL statement.
Example 1: Simple subquery To use a subquery to find the sales of all stores in the West region, we use the following SQL statement: SELECT SUM (Sales) FROM Store_Information WHERE Store_Name IN (SELECT Store_Name FROM Geography WHERE Region_Name = 'West'); ...
--Sub Query -- Here we used the Sub query in where clause to get all the Item_Code where the price>40 now this sub --query reslut we used in our main query to filter all the records which Item_code from Subquery result SELECT * FROM ItemMasters WHERE Item_Code IN (SELECT Item_Co...
A subquery can be nested inside SELECT, INSERT, UPDATE, or DELETE statements or inside another subquery. 4.How does a SQL subquery operate within a query? The inner query (subquery) executes first, and its result is passed to the outer query. This process allows the outer query to use th...
The subquery appears at the end of the script in parentheses. This very simple example returns the ProductCategoryID value from the ProductCategory table in the Production schema. The where clause in the subquery's SELECT statement determines which ProductCategoryID value is returned from the subque...
SQL Server Subquery Example SQL Server IN vs EXISTS What are the Aggregate Functions in SQL SQL Server T-SQL Aggregate Functions SQL Server Window Aggregate Functions SUM, MIN, MAX and AVG SQL SELECT COUNT Function UNION vs. UNION ALL in SQL Server ...
Returning the aggregated value using a subquery and combining that value with the original row is one good example where we could do exactly that. #5 SQL Example – Average (AVG) We need two queries. First shall return the average call duration per employee, while the second shall return ...
SIMPLE :简单的select查询,查询中不包含子查询或者UNION PRIMARY :查询中若包含任何复杂的子查询,最外层查询标记为该标识 SUBQUERY :在SELECT或WHERE列表中包含了子查询 DERIVED :在FROM列表中包含的子查询,被标记为DERIVED(衍生)MySQL会递归执行这些子查询,把结果放在临时表中 ...
Look at an example of a subquery, which is a query that is nested in a SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery in SQL Server.
An Example of Correlated and Uncorrelated subquery in SQL One of the most common examples of a correlated subquery is to find theNth highestsalaried employees like 2nd, 3rd, or 4th highest, you can write a correlated subquery like this : ...