Problem:

How do I define a parameter when creating an advanced query for a custom report?

Resolution:

QUESTION
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How do I define a parameter when creating an advanced query for a custom report?

ANSWER
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Creating parameters in an advanced query is quite a simple process. Replace the constant value in your SQL Query with code which follows the format:

${||}

Default value and guiname are optional values and your parameter name cannot contain any white spaces. For example, to create a parameter which replaces the constant value "Windows XP":

OLD SCTM QUERY
SELECT Count(AttributeValue) FROM TM_ExecInputAttributes WHERE AttributeValue="Windows XP"

NEW SCTM QUERY
SELECT Count(AttributeValue) FROM TM_ExecInputAttributes WHERE AttributeValue=${PLATFORM|"Windows XP"}

Parameter can be view and edited in the Reports -> Parameters tab