The Problem
I need to write an Update query where my SET references an outer joined table.
I can do this fairly easily with SQL Server but I'm having a heck of a time figuring out the syntax in Oracle as I'm only allow a single table in an update query.
I have written the following Oracle query:
UPDATE SalesExt_tmp tmp
SET slsrep = (SELECT three_dig_rep
FROM dw_sls_rep_conv sls
WHERE sls.aims_rep = tmp.slsrep)
WHERE EXISTS (SELECT three_dig_rep
FROM dw_sls_rep_conv sls
WHERE sls.aims_rep = tmp.slsrep)
AND tmp.sysind = 'AIM';
This takes care of the intersection but I need to deal with values in SalesExt_tmp that do not have equivalent matches in dw_sls_rep_conv (I plan to add a case statement to set null values to a default value). To do this I need to set up dw_sls_rep_conv as an outer joined table. But this is where I get stuck.
SQL Server Example
In SQL Server the solution is a piece of cake as you can have multiple tables in an Update Query:
UPDATE SalesExt_tmp tmp
LEFT JOIN dw_sls_rep_conv sls ON sls.aims_rep = tmp.slsrep
SET tmp.slsrep = sls.three_dig_rep
WHERE tmp.sysind = 'AIM';
But I can't for the life of me figure out how to do this in Oracle. I understand that this query will allow my slsrep field to be set to NULL in some occasions which causes me to fear that this operation may not be allowed.
Questions
1) Firstly is this possible in Oracle? (It's got to be, right?)
2) How do I need to restructure my query to pull this off? I'm guessing my WHERE EXISTS clause needs to go... but I'm still stuck as to where to place my JOIN.
If I understood you correctly, you want to set the value to NULL if there is no match in the dw_sls_rep_conv table? If so, just drop your EXISTS condition and all the rows will be updated:
UPDATE SalesExt_tmp tmp
SET slsrep = (SELECT three_dig_rep
FROM dw_sls_rep_conv sls
WHERE sls.aims_rep = tmp.slsrep)
WHERE tmp.sysind = 'AIM';
If there is a match in the dw_sls_rep_conv table, then the slsrep column will be updated with selected value, otherwise, with NULL.
Have you considered using a subquery in your where clause that performs the outer join as you stated like this:
UPDATE SalesExt_tmp tmp
SET slsrep = (SELECT three_dig_rep
FROM dw_sls_rep_conv sls WHERE sls.aims_rep = tmp.slsrep)
WHERE
tmp.rowid in
(SELECT tmp1.rowid
FROM SalesExt_tmp tmp1,
dw_sls_rep_conv sls
WHERE
tmp1.slsrep = sls.aims_rep (+)
AND tmp1.sysind = 'AIM' );
Related
I tried using this sql to update a new column in a table from a value in table that already exists.
update "PROMOTION" t1
set "OFFER_CHAIN_ID" = poc."OFFER_CHAIN_ID"
from "PROMOTION_OFFER_CHAIN" poc
inner join "PROMOTION" on "PROMOTION"."ID" = poc."PROMOTION_ID"
What happened is that the first value of the join got replicated in all the subsequent entries. about a both tables. The original table has unique values all the values in the updated column are the same.
Eventually I used this SQL instead.
update "PROMOTION" t1
set "OFFER_CHAIN_ID" = poc."OFFER_CHAIN_ID"
from "PROMOTION_OFFER_CHAIN" poc
where
t1."ID" = poc."PROMOTION_ID"
This update works and duplicates all the data, 1000 unique elements in the original table, 1000 unique elements in the updated table.
Is this a bug, or is this the expected result?
SQL is behaving correctly. Your original query is:
update "PROMOTION" t1
--------^
set "OFFER_CHAIN_ID" = poc."OFFER_CHAIN_ID"
from "PROMOTION_OFFER_CHAIN" poc inner join
"PROMOTION"
-----------^
on "PROMOTION"."ID" = poc."PROMOTION_ID"
Note that the table PROMOTION is mentioned twice. Not good. So, the join takes place, producing lots of rows. Then there is no correlation to the t1 version of the table.
You don't mention the database you are using. In SQL Server, you would just do:
update p
set "OFFER_CHAIN_ID" = poc."OFFER_CHAIN_ID"
from "PROMOTION_OFFER_CHAIN" poc inner join
"PROMOTION" p
on p."ID" = poc."PROMOTION_ID";
Note the alias is used after the update (or table name with if there is no alias). Now the table is mentioned only once, so the update should behave as desired.
I am trying to update a table using the information that exist from another table. the table that I want to update is called YVDtemp and the second table I am getting the information from is called yvs_textsMain. I also use a 3rd table to match any records that I dont have and this table is called YVD. Here is my update statement.
update Yvdtemp
set
NAME = yvd_textsmain.[name]
SPIC = yvd_textsmain.[rname]
EFFECT = yvd_textsmain.[desc]
where exists (
select yvd_textsMain.[name], yvd_textsMain.[rname], yvd_textsMain.[desc]
from YVD_textsMain
left outer join YVD
on (YVD_textsMain.[rname] = yvd.[spic])
where yvd.[spic] is null);
It seems that this statement is not working. It gives me an error "near 'spic': syntax error
but, when i use use the select statement apart from the update statement the select statement works and I get all the information that is not in YVD table and that information I want to pass it into YVDTemp table.
I am using SQLite.
As there is no matching condition between Yvdtemp and yvd_textsmain how will you map the rows in update statement.
Based on the requirement it looks like you are looking out for an Insert command which can be written as:
INSERT INTO Yvdtemp (NAME, SPIC, EFFECT)
Select yvd_textsMain.[name], yvd_textsMain.[rname], yvd_textsMain.[desc]
from YVD_textsMain
left outer join YVD
on (YVD_textsMain.[rname] = yvd.[spic])
where yvd.[spic] is null
You miss the commas
NAME = yvd_textsmain.[name],
SPIC = yvd_textsmain.[rname],
EFFECT = yvd_textsmain.[desc]
I am attempting to update a field based upon data in a joined table. I've read that the Update command will not work with a table joins in the where clause. However, I cannot use the Exists command workaround as my condition is not the existence of a linked record, but rather a value in that linked record.
update stock S
set stm_auto_key=186086
From
STOCK Left Join
STOCK_RESERVATIONS On STOCK.STR_AUTO_KEY = STOCK_RESERVATIONS.STR_AUTO_KEY
Where
S.QTY_OH > 0 And
S.STM_LOT = 128729 And
STOCK_RESERVATIONS.IND_AUTO_KEY Is Null
The select statement works fine stand alone. However using it in an update command yields "SQL command not properly ended."
Thanks in advance...
I guess, you need something like this, because there might be no FROM clause in UPDATE statement:
update stock S
set stm_auto_key=186086
Where
S.QTY_OH > 0 And
S.STM_LOT = 128729 And
(SELECT STOCK_RESERVATIONS.IND_AUTO_KEY FROM STOCK_RESERVATIONS
WHERE S.STR_AUTO_KEY = STOCK_RESERVATIONS.STR_AUTO_KEY) Is Null
I am new to SQL and despite hours of searching, cannot figure out the SQL query to update records in my members table, based on conditions in my payments table. I'm very confused whether I use a JOIN (and if so what kind) or a Subquery?
Here's what I have so far:
UPDATE wp_mcra_members
SET wp_mcra_members.dues_paid = 1
JOIN wp_mcra_payments ON wp_mcra_payments.member = wp_mcra_members.ID
WHERE wp_mcra_payments.year_paid = '2013' and wp_mcra_payments.reason = 'Dues';
I want the databased to search for any records in the Payments table that meet my conditions of being year 2013 and labeled Dues. Then I want the Members table to update the field dues_paid based on any found records matching those conditions, where the Member ID = Payments Member
The syntax for an update with a join varies by database. Here is generic syntax using a subquery in the where clause:
UPDATE wp_mcra_members
SET dues_paid = 1
where wp_mcra_members.id in (select wp_mcra_payments.member
from wp_mcra_payments
WHERE wp_mcra_payments.year_paid = '2013' and
wp_mcra_payments.reason = 'Dues'
) ;
The syntax you supplied looks like it would work if you are using SQL Server. Oracle does not support JOINs with UPDATE, instead look into using MERGE or Gordon's answer would also work there.
Assuming however you are using MySQL, a JOIN in the UPDATE statement would probably have a better performance than using IN:
UPDATE wp_mcra_members
JOIN wp_mcra_payments ON wp_mcra_payments.member = wp_mcra_members.ID
SET wp_mcra_members.dues_paid = 1
WHERE wp_mcra_payments.year_paid = '2013'
and wp_mcra_payments.reason = 'Dues';
I have two tables in Database , I need to select a field from one table and update it in another table with a condition where id is same .. Is it Possible to write in single query ???
This should work for you:
update storage
set storage.email = (select register.email
from register
where register.id = storage.id)
Yeah it is, you could do this for example:
UPDATE Origin SET DesiredColumn = NewValue
FROM Origin
JOIN NewTable ON Origin.Id = NewTable.Id
And guess the column names were like DesiredColumn in the updating table and NewValue in the table that holds the new value.
Yes, this is possible, although the syntax depends on the type of SQL you are using.
Here is an example for T-SQL (for Microsoft SQL Server)
UPDATE
S
SET
Email = R.Email
FROM
dbo.Register R
INNER JOIN dbo.Storage S
ON S.RegisterID = R.RegisterID