SQL - UNION Clause


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The SQL SELECT statement is used to select data from a database table and the selected data is returned in the form of a table.

Syntax

The syntax for using SELECT statement in different scenarios are given below:

/*select one column*/
SELECT column1 FROM table_name

/*select multiple columns*/
SELECT column1, column2 FROM table_name

/*select whole database table*/
SELECT * FROM table_name

Example:

Consider a database table called Employee with the following records:

EmpIDNameCityAgeSalary
1JohnLondon253000
2MarryNew York242750
3JoParis272800
4KimAmsterdam303100
5RameshNew Delhi283000
6HuangBeijing282800

  • To fetch Name and Salary data of the employees present in the Employee table, the SQL code is:

    SELECT Name, Salary FROM Employee
    

    This will produce the result as shown below:

    NameSalary
    John3000
    Marry2750
    Jo2800
    Kim3100
    Ramesh3000
    Huang2800

  • To fetch all fields of the Employee table, the SQL code will be:

    SELECT * FROM Employee
    

    This result of the following code will be:

    EmpIDNameCityAgeSalary
    1JohnLondon253000
    2MarryNew York242750
    3JoParis272800
    4KimAmsterdam303100
    5RameshNew Delhi283000
    6HuangBeijing282800

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