Can you please help me in updating DB2 table and is there a better way to update this huge table? Adv thxs.
UPDATE RT.ITEM IM SET
IM.ITEMNAME = GT.ITEM_D, IM.ITEMSIZE = GT.SIZE, IM.COLOR = GT.COL,
IM.ITEMINFO = GT.ITEM_I WHERE IM.RET = 14 AND IM.LAN = 10 and
IM.ITEMK IN ( SELECT GT.SN_N FROM GD.G_TEMP GT );
Trying to update a table(RT.ITEM) from another schema table(GD.G_TEMP) and getting below error msg: [Code: -206, SQL State: 42703] DB2 SQL Error: SQLCODE=-206, SQLSTATE=42703, SQLERRMC=GT.ITEM_D
Your code won't work. DB2 doesn't support explicit JOIN
in UPDATE
. But you can do what you want with a correlated subquery:
UPDATE RT.ITEM IM
SET (ITEMNAME, ITEMSIZE, COLOR, ITEMINFO) =
(SELECT GT.ITEM_D, GT.SIZE, GT.COL, GT.ITEM_I
FROM GD.G_TEMP GT
WHERE GT.SN_N = IM.ITEMK
FETCH FIRST 1 ROW ONLY
)
WHERE IM.RET = 14 AND IM.LAN = 10 AND
EXISTS (SELECT 1
FROM GD.G_TEMP GT
WHERE GT.SN_N = IM.ITEMK
);
Hi you can try with merge command, if distinct don't solve your problems in gd_temp table with multiple rows for single sn_n value then you will have to add more filters in subquery.
MERGE INTO RT.ITEM IM
USING
(SELECT DISTINCT
GT.ITEM_D,
GT.SIZE,
GT.COL,
GT.ITEM_I
FROM GD.G_TEMP gt
) gt on gt.sn_n=im.itemk AND IM.RET = 14 AND IM.LAN = 10
WHEN MATCHED THEN UPDATE
SET (im.ITEMNAME, im.ITEMSIZE, im.COLOR, im.ITEMINFO) = (GT.ITEM_D, GT.SIZE, GT.COL, GT.ITEM_I)
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