SQL For Data Analysis > SQL SUB QUERIES

SQL Union

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To aggregate the results of two or more SELECT operations, use the UNION operator. Within UNION, every SELECT statement must have the same amount of columns. The data types in the columns must also be similar.

The Union operator joins the results of two or more searches into a single result set that contains all of the rows from all of the Union's inquiries. It combines two more searches and removes duplicates in this operation. Tables 'A' and 'B', for example, have 1,2, and 3, while table 'C' has 3,4,5.

The UNION operator in SQL Server is used to join the results of two or more SELECT statements. Between the several SELECT statements, it removes duplicate rows. In the result sets, each SELECT statement within the UNION operator must have the same number of columns with similar data types.

Union is faster since it just passes the first SELECT command, parses the second, and adds the results to the end of the output table.

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  1. Getting Started
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  1. SQL Datatypes
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  15. Assignment : SQL Date and Time
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  1. Type of Joins in SQL - INNER, LEFT
    21m 24s
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  6. SQL Joins Practical Session 4
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  7. SQL Joins Practical Session 5
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  1. Practice: SQL Subqueries
    26m 41s
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    25m 7s
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    19m 42s
  8. Correlated Select, Update & Delete Queries
    33m 15s
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    18m 3s
  10. SQL EXCEPT & INTERSECT
    14m 33s
  11. Assignment : SQL SubQueries
    30m 7s

  1. SQL Pivot, UnPivot Practical Example - 1
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    13m 29s
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    24m 50s

  1. Create Tables using Select Statement
    41m 2s
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    23m 32s
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    23m 24s
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    35m 4s
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    22m 42s
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    22m 11s
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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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  1. Career Guideline
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