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SQL Null

NULL is a special value that matches missed data. It means there is no data inserted into the field.

There are operators to detect whether the value is NULL:

  • IS NULL: detects only values that equal to NULL

  • IS NOT NULL: detects values that are not NULL.


              
12

            
SELECT title FROM songs
WHERE album IS NOT NULL
copy

NULL does not match 0 or empty line, it only matches data that is missing and does not exist.

NULL values are ignored in the MIN, MAX, COUNT, AVG, and SUM aggregate functions.

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SectionΒ 3. ChapterΒ 1
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book
SQL Null

NULL is a special value that matches missed data. It means there is no data inserted into the field.

There are operators to detect whether the value is NULL:

  • IS NULL: detects only values that equal to NULL

  • IS NOT NULL: detects values that are not NULL.


              
12

            
SELECT title FROM songs
WHERE album IS NOT NULL
copy

NULL does not match 0 or empty line, it only matches data that is missing and does not exist.

NULL values are ignored in the MIN, MAX, COUNT, AVG, and SUM aggregate functions.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 1
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
We're sorry to hear that something went wrong. What happened?
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