Question : conditions (if,then,else) in SQL

I have to find the proper SQL statement to have a combo box control (control name - Shift) on a form (form name - frmQueryData which I am using to gather 2 other query parameters, Date From/To and Departments) return data in 2 different ways depending on the selection in the Shift combo box. There are 4 options that the user can select in the Shift combo box:

Shift 1
Shift 2
Shift 3
All Shifts

My complete SQL statement is below. When the user selects Shift 1, Shift 2 or Shift 3 from the combo box, the SQL statement works fine and displays what I want to see, what I need added to this part of the SQL statement:

[frmQueryData]![Shift]));

is: if the user selects All Shifts, the query must display the data based only on the other 2 parameters (Date From/To and Departments) and show for all shifts. Hope this is clear.

Code Snippet:

         
             SELECT tblInputs.Safety, tblInputs.Quality, tblInputs.VTS, tblInputs.[Float Count], tblInputs.[Actual Count], tblInputs.[Downtime Issue], tblInputs.[Check box if this is carry over issue:], tblInputs.Date, tblInputs.Departments, tblInputs.Shift, tblInputs.Op
FROM tblInputs
WHERE (((tblInputs.Date) Between [Forms]![frmQueryData]![txtDateFrom] And [Forms]![frmQueryData]![txtDateTo]) AND ((tblInputs.Departments)=[Forms]![frmQueryData]![Departments]) AND ((tblInputs.Shift)=[Forms]![frmQueryData]![Shift]));

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Question : conditions (if,then,else) in SQL

Answer : conditions (if,then,else) in SQL

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