I'm updating a count column in one table with the count of corresponding rows in another table like so, which seems to work fine.
UPDATE #Circuits
SET CMLTotal = (SELECT COUNT(#UTCMLs.Drawing)
FROM #UTCMLs
WHERE #UTCMLs.DRAWING = #Circuits.DRAWING)
Now I need to include the rows from another table, #XRAYCMLs to get the total count of corresponding rows from both tables. I'm thinking UNION, but do not know how to make that happen.
How can I update my existing statement to accomplish my goal?
You might just want + and two subqueries:
Update #Circuits
SET CMLTotal = (select COUNT(u.Drawing)
from #UTCMLs u
where u.DRAWING = #Circuits.DRAWING
) +
(select COUNT(#UTCMLs.Drawing)
from #XRAYCMLs x
where x.DRAWING = #Circuits.DRAWING
);
Related
checked several threads and some did help but now I'm getting an error:
ERROR: more than one row returned by a subquery used as an expression
SQL state: 21000
Not sure what's the exact issue even though read some explanations. Would appreciate if someone could explain with using my code bellow.
I have a table / view called vw_inv_stock_art_global, and it has a column "stock" with a number.
Then also I have a table dis_orderoutdetails with a column "onstock" which needs to copy the "stock" cells based on article_id both tables have in common.
UPDATE dis_orderoutdetails
SET onstock = (SELECT stock
FROM vw_inv_stock_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id)
WHERE onstock is NULL
AND EXISTS(SELECT stock
FROM vw_inv_stoc_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id);
Additional help if you can be bothered:
I was wondering if there's a possibility to change background colour of a cell just in SQL? Wanted to make an if...else and change colours of a cell depending on the result.
The problem is with this part of the statement:
SET onstock = (SELECT stock
FROM vw_inv_stock_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id)
The SELECT query returns more than one row => there are more than one row in the vw_inv_stock_art_global view that has this article_id. If the result of a SELECT is to be used as a value there may only be one matching row.
Not sure about Postgres SQL syntax but it seems you would use LIMIT 1 to solve this.
SET onstock = (SELECT stock
FROM vw_inv_stock_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id LIMIT 1)
However when you use LIMIT you probably need to use an ORDER BY clause as well to make sure that you use the most relevant row, not just any single row that matches the criterion. The most relevant row is most of the times the latest, so if there is some date column that specifies the entry of the row it is a good bet to be the column you need to order on. This is something you need to review according to your needs.
The ORDER BY would be inserted like this:
(Place holder needs to be replaced)
SET onstock = (SELECT stock
FROM vw_inv_stock_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id
ORDER BY <some column>
LIMIT 1)
You can refactor your SQL without using subqueries, like:
UPDATE dis_orderoutdetails
SET onstock = g.stock
FROM vw_inv_stock_art_global
WHERE vw_inv_stock_art_global.article_id = dis_orderoutdetails.article_id
and onstock is NULL;
But be aware that the correctness of this SQL depends on the relationship between dis_orderoutdetails(article_id) and vw_inv_stock_art_global(article_id): article_id isn't a unique column in vw_inv_stock_art_global, this UPDATE won't be predictable, as each dis_orderoutdetails could be updated more than once, with different stock values.
This code is only updating one row, why? It has to do with one of the sub-queries but I am not sure. I'm thinking the WHERE..IN in the UPDATE statement but I am not sure.
UPDATE [sde].[sy1].[Valve_evw]
SET [sde].[sy1].[Valve_evw].[MA]
= (SELECT [sde].[sy1].[Valve_Join_evw].[MC]
FROM [sde].[sy1].[Valve_Join_evw])
WHERE [sde].[sy1].[Valve_evw].[PrimaryKey]
IN (SELECT [sde].[sy1].[Valve_Join_evw].[PrimaryKey]
FROM [sde].[sy1].[Valve_Join_evw]
WHERE [sde].[sy1].[Valve_Join_evw].[MA]
!= [sde].[sy1].[Valve_Join_evw].[MC])
Context:
What I am trying to do is update the MA column in Valve_evw using the MC column in Valve_Join_evw. The PrimaryKey in Valve_evw references equivalent rows as the PrimaryKey in Valve_Join_evw. As in, a single row in Valve_Join_evw will have the same PrimaryKey as a single row in Valve_evw, thus that equivalency can be used to update the records in Valve_evw. Also the MA column is equivalent in both tables. [Note: The Valve_Join_evw table is created with ESRI mapping software using the spatial relationship between the Valve_evw and a separate table, this is how the duplicate rows exist]
I am using database views (hence the '_evw') in SQL Server with a default INSTEAD OF UPDATE trigger. This combination, views and trigger, prevents the use of table joins to do this update. I have also tried MERGE but that will not work either. Therefore I am stuck with the ANSI standard, hence the sub-queries. This script runs with no errors but it only updates a single row whereas there are about 9000 thousand rows in the tables.
The output message:
(1 row(s) affected)
(0 row(s) affected)
First of all let's reduce the eye hurting SQL to what it really is:
update sde.sy1.valve_evw
set ma = (select mc from sde.sy1.valve_join_evw)
where primarykey in (select primarykey from sde.sy1.valve_join_evw where ma <> mc)
WHERE clause
We look for all primarykey in valve_join_evw where a record's ma <> mc. We update all valve_evw records with such primarykey.
SET clause
For a record we want to update, we set ma to the value found with:
select mc from sde.sy1.valve_join_evw
But this query has no where clause, so what value does it select to fill the record's ma field? It selects all mc from valve_join_evw, so the DBMS probably picks one of these values arbitrarily. (It would be better, it raised an error.)
Conclusion
It is very easy to see which records the statement will update.
Which primarykey:
select primarykey from sde.sy1.valve_join_evw where ma <> mc
Which rows:
select *
from sde.sy1.valve_evw
where primarykey in (select primarykey from sde.sy1.valve_join_evw where ma <> mc)
As to the SET clause: Add a WHERE clause to your subquery that relates the record to select to the record to update (same ma? same primarykey?) E.g.:
set ma =
(
select mc
from sde.sy1.valve_join_evw vj
where vj.primarykey = valve_evw.primarykey
and vj.ma = valve_evw.ma
)
Hi there i recomend first to do the select statement and when you are ok with te records retrieved use the same where for the update statement
Here is what the final script looks like.
UPDATE [Valve_evw]
SET [Valve_evw].[MA] =
(
SELECT [Valve_Join_evw].[MC]
FROM [Valve_Join_evw]
WHERE[Valve_Join_evw].[PrimaryKey] = [Valve_evw].[PrimaryKey]
)
WHERE [Valve_evw].[PrimaryKey]
IN (
SELECT [Valve_Join_evw].[PrimaryKey]
FROM [Valve_Join_evw]
WHERE [Valve_Join_evw].[MA]
!= [Valve_Join_evw].[MC]
);
I m struggling to update one column for a table with a sub query. I have a table where currently one of the values is null.
Currently I have:
UPDATE DW1_PURCHASES SET DW1_PURCHASES.TOTAL_AMT =
(
SELECT DW1_PURCHASES.QUANTITY * DW1_PRODUCTS.PRICE
FROM DW1_PURCHASES, DW1_PRODUCTS
WHERE DW1_PURCHASES.PRODUCT_ID = DW1_PRODUCTS.PRODUCT_ID
)
Although subquery returns data which I need to insert I get a error of single row subquery returns multiple rows.How do I basically shift subquery result to the table?
Thanks.
You don't have to JOINthe update table inside the sub-query. Just correlate the sub-query with update table
UPDATE DW1_PURCHASES
SET DW1_PURCHASES.TOTAL_AMT =
(
SELECT DW1_PURCHASES.QUANTITY * DW1_PRODUCTS.PRICE
FROM DW1_PRODUCTS
WHERE DW1_PURCHASES.PRODUCT_ID = DW1_PRODUCTS.PRODUCT_ID
)
Note : If your DW1_PRODUCTS table has duplicated PRODUCT_ID then even now there is a possibility to get the same error
I have one table with the following columns:
T_RESOLVED_DATE
I_HOUSEHOLD_NUMBER
I_RESOLVED_SET_NUMBER
I_STATION_CODE
I_RESOLVED_START_MIN
I_DURATION
I_PERSON_NUMBER
I_COVIEW_DEMO_ID
Initially, I_COVIEW_DEMO_ID is set to null.
Then I have another table with the following columns:
T_RESOLVED_DATE
I_HOUSEHOLD_NUMBER
I_PERSON_NUMBER
I_AGE
T_GENDER
I_COVIEW_DEMO_ID
I am trying to update I_COVIEW_DEMO_ID in the first table by using the value of I_COVIEW_DEMO_ID in the second table where the T_RESOLVED_DATE, I_HOUSEHOLD_NUMBER, and I_PERSON_NUMBER are equal in both tables. The first table may contain multiple rows with the same DATE, HOUSEHOLD_NUMBER, and PERSON_NUMBER, because the rows can vary by the rest of the columns.
I have tried to do a select and a group by which seems to get me part way there, but I am getting a "single-row subquery returns more than one row" error when I try to update the columns in the first table. This is what I've tried, along with variations of it:
UPDATE
Table1
SET
I_COVIEW_DEMO_ID =
(SELECT
b.I_COVIEW_DEMO_ID
FROM Table1 a,
Table2 b
WHERE a.I_HOUSEHOLD_NUMBER = b.I_HOUSEHOLD_NUMBER AND
a.I_PERSON_NUMBER = b.I_PERSON_NUMBER AND
a.T_RESOLVED_DATE = b.T_RESOLVED_DATE
GROUP BY b.I_COVIEW_DEMO_ID);
Any suggestions?
I was able to get it to work using this statement:
MERGE INTO table1 a
USING
(
SELECT DISTINCT
T_RESOLVED_DATE,
I_HOUSEHOLD_NUMBER,
I_PERSON_NUMBER,
I_COVIEW_DEMO_ID
FROM
table2
) b
ON
(
a.T_RESOLVED_DATE = b.T_RESOLVED_DATE
AND a.I_HOUSEHOLD_NUMBER = b.I_HOUSEHOLD_NUMBER
AND a.I_PERSON_NUMBER = b.I_PERSON_NUMBER
) WHEN MATCHED THEN
UPDATE SET
a.I_COVIEW_DEMO_ID = b.I_COVIEW_DEMO_ID;
As per our discussion on the comments this would be a simple PLSQL block to do what you need. I'm doing direct from my head without test, so you may need to fix some sintaxe mistake.
BEGIN
FOR rs IN ( SELECT I_HOUSEHOLD_NUMBER,
I_PERSON_NUMBER,
I_COVIEW_DEMO_ID,
T_RESOLVED_DATE
FROM Table2 ) LOOP
UPDATE Table1
SET I_COVIEW_DEMO_ID = rs.I_COVIEW_DEMO_ID
WHERE I_PERSON_NUMBER = rs.I_PERSON_NUMBER
AND I_HOUSEHOLD_NUMBER = rs.I_HOUSEHOLD_NUMBER
AND T_RESOLVED_DATE = rs.T_RESOLVED_DATE;
END LOOP;
--commit after all updates, if there is many rows you should consider in
--making commits by blocks. Define a count and increment it whithin the for
--after some number of updates you commit and restart the counter
COMMIT;
END;
Hi my problem is I want to update a field in 1 table using another field from several tables dependant upon where the item originates my only problem is the table which im trying to update has several of the same values in so am getting 'single row sub-query returns more than 1 row'. I dont mind all of the updated fields with the same value being the same. Heres my SQL:
update URL_SET_TAB u
Set U.ITEM_NAME = (select a.PROGRAMME_NAME
from (SELECT (nvl(nvl(b.prog_name,c.movie_name), A.URL_1)) as programme_name, a.ID, a.URL_1
FROM URL_SET_TAB a, prog_name_lookup b, movie_name_lookup c
where a.url_1 = b.url_1(+) and a.url_1 = C.MOVIE_URL(+)
) a
where u.ID = a.ID and U.URL_1 = a.URL_1
)
You need to identify a key column which when matched for URL_SET_TAB and inline view a so that the subquery returns only a single record. This is a limitaion of an UPDATE clause.
Thanks,
Aditya