LIKE filtering

Sometimes you need to filter by some non-numeric column, but not by exact value, but some pattern.

One of the clearest examples is filtering emails so only emails hosted on google will be left (@gmail.com). In SQL it can be done by using LIKE statement and pattern built by using some wildcards. The most common wildcards are:

% - represents zero, one or more symbols
_ - represents one, and only one symbol.

For example, pattern a% will match everything starting with a (even single symbol a), pattern _B will match only two-letters strings ending with B.

To solve the task above we can use pattern %@gmail.com, as there is usually more than one symbol before @ symbol, but we don't know the exact number.


              123
            
SELECT *
FROM visitors
WHERE email LIKE '%@gmail.com'

Please note, that you need to place your pattern within single quotes!

Taak

Swipe to start coding

From the audi_cars table extract all the A-series cars (model starts with the letter A).

Oplossing

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Sectie 2. Hoofdstuk 6

LIKE filtering

Sometimes you need to filter by some non-numeric column, but not by exact value, but some pattern.

% - represents zero, one or more symbols
_ - represents one, and only one symbol.

For example, pattern a% will match everything starting with a (even single symbol a), pattern _B will match only two-letters strings ending with B.

To solve the task above we can use pattern %@gmail.com, as there is usually more than one symbol before @ symbol, but we don't know the exact number.


              123
            
SELECT *
FROM visitors
WHERE email LIKE '%@gmail.com'

Please note, that you need to place your pattern within single quotes!

Taak

Swipe to start coding

From the audi_cars table extract all the A-series cars (model starts with the letter A).

Oplossing

Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 2. Hoofdstuk 6

Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties