How SQL query works internally in SQL Server?

How SQL query is executed internally in SQL Server?

SQL Query mainly works in three phases .11) Row filtering - Phase 1: Row filtering - phase 1 are done by FROM, WHERE , GROUP BY , HAVING clause.22) Column filtering: Columns are filtered by SELECT clause.33) Row filtering - Phase 2: Row filtering - phase 2 are done by DISTINCT , ORDER BY , LIMIT clause.

How inner query works in SQL?

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.

How does SQL query execute?

Query Process Steps1Getting Data (From, Join)2Row Filter (Where)3Grouping (Group by)4Group Filter (Having)5Return Expressions (Select)6Order & Paging (Order by & Limit / Offset)

How do I write an inner query in SQL Server?

How to write subqueries in SQL1Select clause: This clause is used to specify the resultset metadata (columns, fixed values, expressions)2From clause: This clause is used to specify the data sources we are querying. ... 3Where clause: This clause is used to specify the data filtering operations needed in the SQL query.