Since we have started dealing with numbers, the next natural question to ask is if it is possible to do math on those numbers, such as summing them up or taking their average. The answer is yes! SQL has several arithematic functions, and they are:
The syntax for using functions is,
SELECT "function type"("column_name")
For example, if we want to get the sum of all sales from our example table,
we would type in
$2750 represents the sum of all Sales entries: $1500 + $250 + $300 + $700.
In addition to using functions, it is also possible to use SQL to perform
simple tasks such as addition (+) and subtraction (-). For character-type
data, there are also several string functions available, such as
concatenation, trim, and substring functions. Different RDBMS vendors
have different string functions implementations, and it is best to consult
the references for your RDBMS to see how these functions are used.
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