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SQL UNION ALL Operator

This page has all the information about UNION ALL operator, which is used to join all the values from the SELECT queries.

Similar records were not considered in the result in the UNION operator, but UNION ALL considered similar records in the output obtained after the UNION ALL query was executed.

The syntax for UNION ALL Operator is:

SELECT Column_Name_1, Column_Name_2, Column_Name_3, Column_Name_4, Column_Name_5 FROM Table_Name_1 UNION ALL SELECT Column_Name_1, Column_Name_2, Column_Name_3, Column_Name_4, Column_Name_5 FROM Table_Name_2;

Rules to be followed to operate using UNION ALL Operator are as follows:

  1. The number of Columns and Order of Columns must be the same.
  2. The data type must be Compatible.

Let's learn the concept of SQL UNION ALL operator with the help of an example

Consider the already existing table with the following data.

Table Name 1: Diploma_Student

Student_IdStudent_NameFirst_SemSecond_SemThird_SemFourth_SemFifth_SemSixth_SemTotalDepartment_Id
202111Vaishnavi Patil949188859592916
202112Vaibhav Lokhande859092808582862
202113Yash Dhull908894878590893
202114Sonali Patole959092889290914
202115Axar Patel858082869284851
202116Meena Mishra787580748577783
202117Mahesh Kumbhar758075788076775
202118Sakshi Patil807874788077782
202119Sopan Bhore706875758080752
202220Prajwal Lokhande808585757880814
202221Anuja Wanare858886828485857
202222Venkatesh Iyer908987909291903
202223Anushka Sen707571748078751
202224Aakash Jain807572748580787
202225Akshay Agarwal858078889082847

Table Name 2: D_Students

Student_IdStudent_NameFirst_SemesterSecond_SemesterThird_SemesterFourth_SemesterFifth_SemesterSixth_SemesterTotalDepartment_Id
202111Vishaka Jain949188859592916
202112Vaibhav Lokhande859092808582862
202113Yash Dhull908894878590893
202114Sonali Patole959092889290914
202115Aman Sharma858082869284851
202116Meena Mishra787580748577783
202117Manan Vohra758075788076775
202118Sakshi Patil807874788077782
202119Sopan Bhore706875758080752
202220Pratik Rokade808585757880814
202221Ashwini Shewani858886828485857
202222Venkatesh Iyer908987909291903
202223Anushka Sen707571748078751
202224Aakash Jain807572748580787
202225Aman Gupta858078889082847

Example 1: write a query to perform UNION ALL between the Diploma_Student and D_Students tables.

SELECT * FROM Diploma_Student UNION ALL SELECT * FROM D_Students;

We have used two SELECT statements. The First SELECT statement displays the records from the Diploma_Student table performing UNION ALL operation with the records displayed by the Second SELECT statement from the D_Students table in the above UNION ALL operator example.

The output of the above query is as follows:

Student_IdStudent_NameFirst_SemSecond_SemThird_SemFourth_SemFifth_SemSixth_SemTotalDepartment_Id
202111Vaishnavi Patil949188859592916
202112Vaibhav Lokhande859092808582862
202113Yash Dhull908894878590893
202114Sonali Patole959092889290914
202115Axar Patel858082869284851
202116Meena Mishra787580748577783
202117Mahesh Kumbhar758075788076775
202118Sakshi Patil807874788077782
202119Sopan Bhore706875758080752
202220Prajwal Lokhande808585757880814
202221Anuja Wanare858886828485857
202222Venkatesh Iyer908987909291903
202223Anushka Sen707571748078751
202224Aakash Jain807572748580787
202225Akshay Agarwal858078889082847
202111Vishaka Jain949188859592916
202112Vaibhav Lokhande859092808582862
202113Yash Dhull908894878590893
202114Sonali Patole959092889290914
202115Aman Sharma858082869284851
202116Meena Mishra787580748577783
202117Manan Vohra758075788076775
202118Sakshi Patil807874788077782
202119Sopan Bhore706875758080752
202220Pratik Rokade808585757880814
202221Ashwini Shewani858886828485857
202222Venkatesh Iyer908987909291903
202223Anushka Sen707571748078751
202224Aakash Jain807572748580787
202225Aman Gupta858078889082847
SQL UNION ALL Operator

Example 2: write a query to perform UNION ALL between the Diploma_Student and D_Students tables ORDER BY Department Id.

SELECT * FROM Diploma_Student UNION ALL SELECT * FROM D_Students ORDER BY Department_Id;

We have used two SELECT statements. The First SELECT statement displays the records from the Diploma_Student table performing UNION ALL operation with the records displayed by the Second SELECT statement from the D_Students table ORDER BY Department Id in the above UNION ALL operator example.

The output of the above query is as follows:

Student_IdStudent_NameFirst_SemSecond_SemThird_SemFourth_SemFifth_SemSixth_SemTotalDepartment_Id
202115Aman Sharma858082869284851
202223Anushka Sen707571748078751
202115Axar Patel858082869284851
202223Anushka Sen707571748078751
202118Sakshi Patil807874788077782
202112Vaibhav Lokhande859092808582862
202112Vaibhav Lokhande859092808582862
202119Sopan Bhore706875758080752
202118Sakshi Patil807874788077782
202119Sopan Bhore706875758080752
202113Yash Dhull908894878590893
202222Venkatesh Iyer908987909291903
202116Meena Mishra787580748577783
202116Meena Mishra787580748577783
202113Yash Dhull908894878590893
202222Venkatesh Iyer908987909291903
202220Pratik Rokade808585757880814
202220Prajwal Lokhande808585757880814
202114Sonali Patole959092889290914
202114Sonali Patole959092889290914
202117Mahesh Kumbhar758075788076775
202117Manan Vohra758075788076775
202111Vishaka Jain949188859592916
202111Vaishnavi Patil949188859592916
202221Ashwini Shewani858886828485857
202225Aman Gupta858078889082847
202221Anuja Wanare858886828485857
202224Aakash Jain807572748580787
202225Akshay Agarwal858078889082847
202224Aakash Jain807572748580787
SQL UNION ALL Operator



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