case whenあるフィールド値の分類について議論する

SELECT SM_ID,SM_CID,SM_STATION,SM_TIME,PS_CODE,PS_NUMBER,SS_NAME,SS_CODE,

(CASE WHEN SM_TYPE=1 THEN '   '  WHEN SM_TYPE=2 THEN '   '  END)

FROM dbo.PDA_STATION_MANAGE sm

LEFT JOIN dbo.PDA_SIM ps ON sm.SM_CID=ps.PS_CID

LEFT JOIN dbo.SBD_STATION ss ON sm.SM_STATION=ss.SS_ID