【DB2】根据映射表映射出结果

CREATE TABLE OLIVER_01(ID INT,COM_TYPE VARCHAR(100),SR DECIMAL(18,2),YQFL VARCHAR(10));

INSERT INTO OLIVER_01 VALUES(1,‘A1‘,30000000,‘O‘);

INSERT INTO OLIVER_01 VALUES(2,‘A2‘,30000000,‘O‘);

INSERT INTO OLIVER_01 VALUES(3,‘B1‘,100000000,‘BB‘);

INSERT INTO OLIVER_01 VALUES(4,‘B2‘,100000000,‘BB‘);

INSERT INTO OLIVER_01 VALUES(5,‘C‘,100000000,‘O‘);

INSERT INTO OLIVER_01 VALUES(6,‘A1‘,NULL,‘O‘);

INSERT INTO OLIVER_01 VALUES(7,‘A2‘,NULL,‘O‘);

INSERT INTO OLIVER_01 VALUES(8,‘B1‘,NULL,‘O‘);

INSERT INTO OLIVER_01 VALUES(9,‘B2‘,NULL,‘O‘);

INSERT INTO OLIVER_01 VALUES(10,‘A1‘,30000001,‘O‘);

第三步骤：查询结果

SELECT T.*

,(SELECT RES FROM OLIVER_MAP A

WHERE (A.COM_TYPE IS NULL OR A.COM_TYPE=T.COM_TYPE)

AND (A.SR_UP IS NULL OR A.SR_UP>=T.SR)

 AND (A.SR_LIM IS NULL OR A.SR_LIM<T.SR)

 ORDER BY A.ID FETCH FIRST ROW ONLY) AS RES

FROM OLIVER_01 T

该案例适用于存在映射表，然后根据映射表匹配得出结果！

【DB2】根据映射表映射出结果

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本文系统来源：http://www.cnblogs.com/OliverQin/p/7340714.html