https://stackoverflow.com › questions › 2214525

IsNull forces the result-type to the type of argument1, while coalesce uses the respective types for each argument. If you just search-and-replace isnull with coalesce, you can potentially get a lot of errors...

https://www.postgresqltutorial.com › postgresql-tutorial › postgresql-isnull

PostgreSQL does not have the ISNULL function. However, you can use the COALESCE function which provides similar functionality. Note that the COALESCE function returns the first non-null argument, so the following syntax has a similar effect as the ISNULL function above: COALESCE(expression,replacement)

https://stackoverflow.com › questions › 23766084

What is best way to check if value is null or empty string in Postgres sql statements? Value can be long expression so it is preferable that it is written only once in check. Currently I'm using: coalesce( trim(stringexpression),'')='' But it looks a bit ugly.

https://dev.to › dbvismarketing › handling-nulls-in-postgresql-alternatives-to-isnull-191f

Learn about effective alternatives to the ISNULL function in PostgreSQL, focusing on COALESCE and CASE statements. PostgreSQL's approach to NULL values includes functions like COALESCE , which handles multiple inputs:

https://docs.postgresql.fr › 11 › functions-comparison.html

Pour les entrées non NULL, IS DISTINCT FROM est identique à l'opérateur <>. Néanmoins, si les entrées sont NULL, il renvoie faux. Si une seule entrée est NULL, il renvoie vrai.

https://www.postgresqltutorial.com › postgresql-tutorial › postgresql-coalesce

In practice, you often use the COLAESCE() function to substitute a default value for null when querying data from nullable columns. For example, if you want to display the excerpt from a blog post and the excerpt is not provided, you can use the first 150 characters of the content of the post.

https://medium.com › the-table-sql-and-devtalk › postgresql-isnull-function-the-missing...

The PostgreSQL ISNULLexample equivalent for that query is: 1 SELECT name, price, COALESCE(stock_level, 0) AS stock_level 2 FROM products; Similarly, COALESCE also returns the non-NULL expression.

https://yoshi.dbvis.com › webb › thetable › isnull-postgresql-example

Let’s figure out whether or not the PostgreSQL ISNULL function exists and explore ISNULL function alternatives and example list to get the same functionality.