SQL For Data Analysis > SQL SUB QUERIES

Practice: SQL Subqueries & Unions

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  • A subquery is a query that returns one or more rows of data from a parent table.
  • An example of a common use for a subquery is to return the total amount of sales for each customer.

Subqueries are used to retrieve data from a table in SQL. They are also known as cross-joins.

There are many types of subqueries that can be used in SQL.

  • Example 1: With a subquery, we can retrieve data from the same table, but with different conditions.
  • Example 2: We can use a subquery to return all the rows that meet a certain condition.
  • Example 3: A subquery is useful when we need to select only one column from more than one table, but with different conditions.

Subqueries are used when you want to work with a subset of data in a SQL statement. They are typically used in SQL statements to filter, sort, and group data.

UNION ALL is a SQL Server command. It is used to combine multiple SELECT statements into a single SELECT statement. While UNION is used to combine rows from multiple tables, UNION ALL combines columns from the same table.

Subqueries are useful when you want to get the result of a query without having to use the SELECT statement. They can be used in different ways such as filtering data or grouping data by specific criteria.

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  3. What is DBMS
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  1. Filtering Data using Selection Command
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  10. Row Number Function
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  12. How to use SQL Conditional Statements
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  14. SQL Practical with Examples
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  15. Assignment : SQL Date and Time
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  1. Type of Joins in SQL - INNER, LEFT
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  3. SQL Joins Practical Session 1
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  4. SQL Joins Practical Session 2
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  5. SQL Joins Practical Session 3
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  6. SQL Joins Practical Session 4
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  7. SQL Joins Practical Session 5
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  8. Assignment : SQL Joins
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  9. Assignment : SQL Functions 1
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  10. Assignment : SQL Functions 2
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  1. Practice: SQL Subqueries
    26m 41s
  2. Practice: SQL Subqueries & Unions
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  3. SQL Correlated Subqueries Part 1
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  4. SQL Correlated Subqueries Part 2
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  5. SQL Correlated Subqueries Part 3
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  6. SQL Correlated Subqueries Part 4
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  7. SQL Correlated Subqueries Part 5
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  8. Correlated Select, Update & Delete Queries
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  9. SQL Union
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  10. SQL EXCEPT & INTERSECT
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  11. Assignment : SQL SubQueries
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  1. What is SQL Index?
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  2. SQL Index types
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  1. Create Tables using Select Statement
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  2. Using Correlated Sub Query, Group By with Select Statement
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    23m 32s
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  5. Using Union with Select Statement
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  6. Adding Multiple Records with Insert Statement
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  7. SQL Insert - Considerations and Best Practices
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  8. Insertion from Multiple Tables
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  10. SQL Delete - Types of Delete Operation Part -2
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  11. Assignment : SQL Insert, Update & Delete
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  1. Loading & Connecting Different Files in SQL
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  1. Course Summary
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  1. Interview Questions Part 1
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