Top "Null" questions

How to use NULL or empty string in SQL

I would like to know how to use NULL and an empty string at the same time in a WHERE …

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Check if object exists in JavaScript

How do I verify the existence of an object in JavaScript? The following works: if (!null) alert("GOT HERE"); But …

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Why is null an object and what's the difference between null and undefined?

Why is null considered an object in JavaScript? Is checking if ( object == null ) Do something the same as if ( !object ) …

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How can I check if a string is null or empty in PowerShell?

Is there a built-in IsNullOrEmpty-like function in order to check if a string is null or empty, in PowerShell? I …

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DateTime "null" value

I've been searching a lot but couldn't find a solution. How do you deal with a DateTime that should be …

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Check if a string is null or empty in XSLT

How can I check if a value is null or empty with XSL? For example, if categoryName is empty? I'm …

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How to check if my string is equal to null?

I want to perform some action ONLY IF my string has a meaningful value. So, I tried this. if (!myString.…

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Why is my Spring @Autowired field null?

Note: This is intended to be a canonical answer for a common problem. I have a Spring @Service class (MileageFeeCalculator) …

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JavaScript checking for null vs. undefined and difference between == and ===

How do I check a variable if it's null or undefined and what is the difference between the null and …

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JavaScript null check

I've come across the following code: function test(data) { if (data != null && data !== undefined) { // some code here } } I'm …

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