Oracle中的SUM用法讲解

 SELECT AREA_CODE, SUM ( CASE WHEN IPTV_NBR IS NULL or IPTV_NBR = '' THEN 0 ELSE 1 END ), SUM ( CASE WHEN ACC_NBR IS NULL or ACC_NBR = '' THEN 0 ELSE 1 END ), COUNT (*) FROM GAT_SQMS.GAT_SQMS_BAND_IPTV_VIEW GROUP BY AREA_CODE;

 SUM ( CASE WHEN IPTV_NBR IS NULL or IPTV_NBR = '' THEN 0 ELSE 1 END )

 CREATE OR REPLACE FUNCTION SumString(i_TableName IN VARCHAR2, i_GroupColName IN VARCHAR2, i_ResultColName IN VARCHAR2, i_GroupColValue IN VARCHAR2, i_Separator IN VARCHAR2) RETURN VARCHAR2 IS TYPE T_Cur IS REF CURSOR; C_Cur T_Cur; V_Sql VARCHAR2(2000); V_Result VARCHAR2(2000); V_Tmp VARCHAR2(200); V_Cnt NUMBER := 0; BEGIN V_Result := ' '; V_Sql := 'SELECT ' || i_ResultColName || ' FROM ' || i_TableName || ' WHERE ' || i_GroupColName || ' = ' || i_GroupColValue; OPEN C_Cur FOR V_Sql; LOOP FETCH C_Cur INTO V_Tmp; EXIT WHEN C_Cur%NOTFOUND; IF V_Cnt = 0 THEN V_Result := V_Tmp; ELSE V_Result := V_Result || i_Separator || V_Tmp; END IF; V_Cnt := V_Cnt + 1; END LOOP; CLOSE C_Cur; RETURN V_Result; END SUMSTRING;