Top "Isnull" questions

How does Left Join / IS NULL eliminate records which are there in one table and not in the other?

I am having a tough time to understand why does LEFT JOIN / IS NULL eliminate records which are there in …

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How to encapsulate IIF and ISNULL call in Access 2010 VBA?

I use the following expression pattern in my Access 2010 database frequently: IIF(ISNULL(fieldName), Null, myFunction(fieldName)) Here myFunction is …

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SQL Server NULL Integer to Empty String using ISNULL

My curiosity always gets the best of me and I've searched online for an explanation to this and came up …

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Scala Check optional string is null or empty

I am a newbie to Scala and I want to learn how can I add null and empty check on …

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Oracle ORA-01722: invalid number Error because of WHERE IS NULL Condition

I have the following SQL: Select MyNumber FROM (SELECT to_number(Name) AS MyNumber FROM TableA WHERE regexp_replace(Name, …

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Why is T-SQL ISNULL() truncating the string and COALESCE is not?

Given the following: SELECT ISNULL('XY' + NULL, 'ABCDEFGHIJ') -- Outputs ABC (Why?) SELECT COALESCE('XY' + NULL, 'ABCDEFGHIJ') -- Outputs ABCDEFGHIJ …

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mysql if not null, 0 or ""

SELECT * FROM table WHERE id IN ('21') AND (content_id IS NULL OR content_id = 0 OR content_id = '') …

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