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If you want to test a calculation or a function in SQL, you don't need to test on real data.
SELECT 2 + 3 AS [Answer]
The SQL shown above will return just one result (I aliased the column for clarity).
The Results grid
I didn't use a FROM clause as I am not using table data.
Here I am testing the built-in MONTH function. I am not expecting any surprises!
SELECT MONTH('04/03/1964')
The surprising (to anyone apart from Americans) result is below.
I did not use an alias so we see (No column name).
SQL reads the date as 'MM/dd/yyyy' so '04/03/1964' is the 3rd of April not the 4th of March.
Because you are not limited to the contents of a table of test data you can use any data you want, including data you know would be invalid.
You can learn more about this topic on the following Wise Owl courses:
Kingsmoor House
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GLOSSOP
SK13 2AA
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99 Bishopsgate
LONDON
EC2M 3XD
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