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 NULLIS NOT NULL: detects values that are not NULL.
12SELECT title FROM songs WHERE album IS NOT NULL
NULLdoes not match 0 or empty line, it only matches data that is missing and does not exist.
NULLvalues are ignored in theMIN,MAX,COUNT,AVG, andSUMaggregate functions.
Bedankt voor je feedback!
single
Vraag AI
Vraag AI
Vraag wat u wilt of probeer een van de voorgestelde vragen om onze chat te starten.
Vat dit hoofdstuk samen
Explain code
Explain why doesn't solve task
Awesome!
Completion rate improved to 4.17SQL Null
Veeg om het menu te tonen
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 NULLIS NOT NULL: detects values that are not NULL.
12SELECT title FROM songs WHERE album IS NOT NULL
NULLdoes not match 0 or empty line, it only matches data that is missing and does not exist.
NULLvalues are ignored in theMIN,MAX,COUNT,AVG, andSUMaggregate functions.
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
Awesome!
Completion rate improved to 4.17single
