Ms Access Query with Case Statement

What is the equivalent of Select Case in Access SQL?

Consider the Switch Function as an alternative to multiple IIf() expressions. It will return the value from the first expression/value pair where the expression evaluates as True, and ignore any remaining pairs. The concept is similar to the SELECT ... CASE approach you referenced but which is not available in Access SQL.

If you want to display a calculated field as commission:

SELECT
    Switch(
        OpeningBalance < 5001, 20,
        OpeningBalance < 10001, 30,
        OpeningBalance < 20001, 40,
        OpeningBalance >= 20001, 50
        ) AS commission
FROM YourTable;

If you want to store that calculated value to a field named commission:

UPDATE YourTable
SET commission =
    Switch(
        OpeningBalance < 5001, 20,
        OpeningBalance < 10001, 30,
        OpeningBalance < 20001, 40,
        OpeningBalance >= 20001, 50
        );

Either way, see whether you find Switch() easier to understand and manage. Multiple IIf()s can become mind-boggling as the number of conditions grows.

MS Access Query with CASE statement

MS Access does not support CASE statements. Use IIF:

IIF(tsl.activitat <> '', tsl.activitat, ts.activitat ) AS Activitat

I'm not sure if Access supports aliases on LEFT JOIN either, but it probably does

Note (although correctly tagged), the title of your question might be troublesome... most people refer to Transact-SQL (TSQL) when writing "MS SQL". Transact-SQL is used by MS SQL Server, but not by MS Access, which uses its own SQL dialect (called "Access SQL", and pretty limited in comparison)

Does MS Access support CASE WHEN clause if connect with ODBC?

You could use IIF statement like in the next example:

SELECT
   IIF(test_expression, value_if_true, value_if_false) AS FIELD_NAME
FROM
   TABLE_NAME

Case Statement - using BETWEEN. Ms Access to SQL Server

The Switch function doesn't take SQL syntax. So:

Switch([Age] <= 17, '0-17',
    [Age] <= 30, '18-30', 
    [Age] <= 45, '30-45', 
    [Age] <= 60, '45-60', 
    [Age] > 60, 'Over 60')

CASE statement in Access 2013 (and how to use it)?

Thanks for Gord Thompson for giving me a clue, this is what I was looking for, it's working perfect :

expr1: Switch([date_]=Date(),"today",
              [date_]=Date()-1,"yesterday",
              [date_]>Date()-7,"week ago")

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