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    HAVING Clause

    Introduction

    The HAVING clause is used to select data records based on a specified condition. You can also apply ZCQL functions in the query using this clause. The HAVING clause can only be used with SELECT queries.

    The syntax for using the HAVING clause is shown below:

        
    
        
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         SELECT column_name FROM base_table_name GROUP BY column_name HAVING column_name OPERATOR condition

    Operators Supported by the HAVING Clause

    You can use the following operators in the HAVING conditions in ZCQL SELECT queries:

    Operators Description
    = Equal to
    IS TRUE if the operand is the same as the value
    IS NULL TRUE if the operand is a null value
    IS NOT NULL TRUE if the operand is not a null value
    =! Not equal to
    LIKE TRUE if the operand matches a pattern
    NOT LIKE TRUE if the operand does not match a pattern
    BETWEEN TRUE if the operand value is between the start and end values
    IN TRUE if the operand is equal to a list of expressions
    NOT IN TRUE if the operand is not equal to a list of expressions
    > Greater than
    >= Greater than or equal to
    < Lesser than
    <= Lesser than or equal to

    ZCQL Functions with HAVING Clause

    ZCQL functions like SUM(), COUNT(), AVG(), etc., can be used with the HAVING clause in a SELECT query.

    Example Database:

    The employee details of Zylker Technologies are being maintained in the Data Store in the Zylker_Employee_DB table. The table contains the following columns and rows:

    ID Name Department Salary
    ZT-001 Amelia Burrows Product Management 15000
    ZT-2001 Bruce Wayne Sr. Management 85000
    ZT-239 Clark Kane Media Relations 85000
    ZT-4289 Michelle Mascarenhas Finance 89000

    Lets, use the AVG() ZCQL function, with the HAVING clause in an example SELECT query. 

        
    
        
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         SELECT Name, Department, Salary FROM Zylker_Employee_DB GROUP BY Department HAVING AVG(Salary) > 50000

    Zylker_Employee_DB.Salary Zylker_Employee_DB.Department Zylker_Employee_DB.Name
    85000 Sr. Management Bruce Wayne
    89000 Finance Michelle Mascarenhas
    Note:

    • This functionality is only available in ZCQL V2.

    • From December 01st, 2024, all your current projects in all your Orgs present in the Development Environment will be automatically mapped to ZCQL V2 Parser.

    • From April 01st, 2025, all the projects present in all Orgs that have already been mapped to ZCQL V2 Parser in Development Environment will be automatically mapped to ZCQL V2 Parser in the Production Environment, if and when production is enabled for the project.

    Last Updated 2024-09-03 16:31:06 +0530 +0530

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