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  1. www.postgresqltutorial.com › postgresql-tutorial › postgresql-coalescePostgreSQL COALESCE() Function - PostgreSQL Tutorial

    The COALESCE () function evaluates arguments from left to right until it finds the first non-null argument. All the remaining arguments from the first non-null argument are not evaluated. The COALESCE function provides the same functionality as NVL or IFNULL function provided by SQL standard.

    • Nullif

      Second, the COALESCE function checks if the first argument,...

    • Is Null

      PostgreSQL offers some useful functions to handle NULL...

    • UUID

      Summary: in this tutorial, you will learn about the...

    • Array

      Summary: in this tutorial, you will learn how to work with...

  2. www.enterprisedb.com › postgres-tutorials › how-use-coalesce-postgresqlHow to use COALESCE in PostgreSQL - EDB

    24 sty 2023 · The COALESCE function returns the first non-NULL expression in the specified list. If all the arguments are NULL then it will return NULL as its output. The supported syntax is: COALESCE (value_1,value_2,value_3,........value_n) The parameters or arguments are: value_1,value_2,value_3,........value_n.

  3. www.geeksforgeeks.org › postgresql-coalescePostgreSQL COALESCE - GeeksforGeeks

    22 lip 2024 · The COALESCE function returns the first non-null argument among its parameters, making it particularly useful in SELECT statements. Let us better understand the syntax, usage, and practical examples of the COALESCE function, helping you master its application in PostgreSQL.

  4. www.tutorialsteacher.com › postgresql › coalesce-functionPostgreSQL COALESCE Function: Get First Non-NULL Value

    In PostgreSQL, the COALESCE () function is used to get the first non-null value among the specified arguments. It returns the first of its arguments that is not null. If all arguments are NULL, it will return a NULL value. It is often used to substitute a default value for null values.

  5. www.sqlshack.com › learn-the-postgresql-coalesce-commandLearn the PostgreSQL COALESCE command - SQL Shack

    19 sty 2023 · Coalesce in PostgreSQL. The coalesce function’s role is to return the first non-null value it encounters when reading from left to right. In addition, it can replace null values with a specified non-null value. The Coalesce function requires a minimum of two inputs. The syntax of the PostgreSQL COALESCE function is as given below:

  6. www.postgresql.org › docs › currentPostgreSQL: Documentation: 17: 9.18. Conditional Expressions

    26 wrz 2024 · COALESCE(value [, ...]) The COALESCE function returns the first of its arguments that is not null. Null is returned only if all arguments are null. It is often used to substitute a default value for null values when data is retrieved for display, for example: SELECT COALESCE(description, short_description, '(none)') ...

  7. stackoverflow.com › questions › 27479180Using COALESCE to handle NULL values in PostgreSQL

    15 gru 2014 · You can use COALESCE in conjunction with NULLIF for a short, efficient solution: COALESCE( NULLIF(yourField,'') , '0' ) The NULLIF function will return null if yourField is equal to the second value ('' in the example), making the COALESCE function fully working on all cases:

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