FB-3 Update, Where In

[henry...@hotmail.com]

Good Morning,

I want to update some of my ITEMS  table's Total_in (IN_Q) and Total_Out(OUT_Q) quantities

ITEMS Table to be updated 

ITEMNO   IN_Q   OUT_Q

AA

BB

CC

DD

Sum Quantities informations will be taken from below View

ITEMMOVEMENTS 

ITEMNO.....IN_Q....OUT_Q

AA                10         0

BB                 20        0

AA                   0        5

CC                   2        0

....

ItemNo information will be taken from below PLIST table

PLIST

ITEMNO

AA          

BB          

That is, i want to Update Just  AA and BB ItemNos in the Items Table

I wrote below SQL but I was not successful

UPDATE ITEMS IT

SET IT.IN_Q = (SELECT SUM(IM.IN_Q)
              FROM ITEMMOVEMENTS IM
              WHERE IM.ITEMNO IN (SELECT ITEMNO FROM PLIST WHERE ID = 2))
WHERE IT.ITEMNO IN (SELECT ITEMNO FROM PLIST WHERE ID = 2),

IT.OUT_Q = (SELECT SUM(IM.OUT_Q)
               FROM ITEMMOVEMENTS IM
               WHERE IM.ITEMNO IN (SELECT ITEMNO FROM PLIST WHERE RNO = 2))
WHERE IT.ITEMNO IN (SELECT ITEMNO FROM PLIST WHERE RNO = 2)

Could someone please help

Thank You

[Péter Ádám]

Hello!

" i want to Update Just  AA and BB ItemNos "

yet your query looks for an ID and for a RNO which both are 2 - what is RNO? Is it different from ID?

If PLIST contains only the ItemNos to update then why filter them with WHERE clause from PLIST?

Also is the ITEMMOVEMENTS  view based on the ITEMS table?

[henry...@hotmail.com]

Thank you so much Lape

I'm so sorry i mistakely wrote RNO it is actually ID (RNO=ID)

Items Table is like PARTCARD, there  i keep parts informations (PartNo, PartName, Incomeqty  OutGoQty, Stock..)

ItemMovements is a View and collects all Parts Movements (from Dispatch, Invoice etc..)

[Svein Erling Tysvær]

Hi Henry!

One of the first things I learnt about Firebird (well, it might have been InterBase) was to never use IN (<subselect>) since it was exceedingly slow (it may be better in newer versions of Firebird). Luckily, replacing IN (<subselect>) with EXISTS(<subselect>) is trivial and I've never even wanted to use IN (<subselect>) the last 26 or 27 years and only use IN with constants.

In your case, using MERGE may be a better alternative, e.g. (completely untested)

MERGE INTO ITEMS I
USING (SELECT P.ITEMNO, SUM(IM.IN_Q) IN_Q_SUM, SUM(IM.OUT_Q) OUT_Q_SUM
       FROM PLIST P
       JOIN ITEMMOVEMENTS IM ON P.ITEMNO = IM.ITEMNO
       WHERE P.ID = 2) TMP ON I.ITEMNO = TMP.ITEMNO
WHEN MATCHED THEN UPDATE SET I.IN_Q = TMP.IN_Q_SUM, I.OUT_Q = TMP.OUT_Q_SUM

You never mentioned it, but you can also use MERGE for inserting in case there should happen to be ITEMNOs in PLIST and ITEMNOVEMENTS that does not yet exist in ITEMS.

Hopefully this can get you started,
Set

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[henry...@hotmail.com]

Thank you SO MUCH Set