below query i need to write case statment (how to write case stament)

i have two table's EMPUDF_E and CSTMSELELEM_E and key column are EMPUDF_E.CUSTOMSELECTIONELEMENT_I=CSTMSELELEM_E.NUMBER_I

get CSTMSELELEM_E.NAME_N in to temp variable X(please i need it as in case stament)

If ((value of X="Other (please specify below)")  OR (EMPUDF_E.VAL where EMPUDF_E.UDFNAME="P_OtherLanguages") <>  NULL/Blank)  Then

{

  SET "OTHER"

}

  Else

{

    Set X

}