Update a query with two tables

CREATE TABLE T1
(
FIELD1 VARCHAR2 (10),
VALUE1 INTEGER,
FIELD2 VARCHAR2 (10),
INTEGER VALUE2
)

INSERT INTO T1 VALUES('OLD',100,'NEW',1000);
INSERT INTO T1 VALUES('OLD',200,'NEW',2000);
INSERT INTO T1 VALUES('OLD',300,'NEW',3000);

CREATE TABLE T2
(
DOMAIN VARCHAR2 (10),
AN INTEGER VALUE,
NAM VARCHAR2 (10)
)
INSERT INTO T2 VALUES('OLD',100,'ABC');
INSERT INTO T2 VALUES ('OLD', 200', 'ABC');
INSERT INTO T2 VALUES('OLD',600,'ABC');
INSERT INTO T2 VALUES('OLD',300,'XYZ');

There are currently some old values in table T2. But the current requirement is again present corresponding values in table T1 should be taken into account. A condition more is the NAM = 'ABC '.

I'm writing this way. Is to obtain target updated by several rows from the source. Please help sregard thi.

T2 UPDATE
SET A.FIELD = B.FIELD2, A.VALUE = B.VALUE2
T1 INNER JOIN T2 B
ON T2. VALUE = T1. VALUE1
AND T2. NAM = 'ABC '.


Concerning
KVB

You need something more to...

UPDATE T2 A
SET (A.FIELD, A.VALUE)=(SELECT B.FIELD2,B.VALUE2
                        FROM   T1 B
                        WHERE  A.VALUE=B.VALUE1)
WHERE T2.NAM='ABC'

(not tested)

Tags: Database

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