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SQL Tutorial for Beginners
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SQL Tutorial for Beginners

SQL Tutorial for Beginners

1. Database & Introduction to Syntax
Meet the SQLSelect the Songs!SQL Select ColumnSQL DistinctSQL WhereChallenge WhereSQL And, Or, Not
2. SQL Aggregate Functions
SQL Min and MaxChallenge Min and MaxSQL Count, Sum, AvgChallenge Count
3. Filtering Statements
SQL NullSQL LikeChallenge LikeSQL BetweenSQL Order ByChallenge Order BySQL Group ByChallenge Group BySQL Top and LimitSQL AliasesSQL HavingChallenge HavingSQL Comments

bookSQL 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 desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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Seção 3. Capítulo 1
toggle bottom row

bookSQL 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 desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 3. Capítulo 1
toggle bottom row

bookSQL 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 desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

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 desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 3. Capítulo 1
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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