I have the following query :
update tab1.abc,
tab1.sbd = (select tab2.abc, tab2.sbd from tab2,tab1 where --some conditions)
where exists(select tab2.abc, tab2.sbd from tab2,tab1 where --some conditions)
Now my task is to optmize this query.
I believe removing the exists clause or combining both the where clauses would help a lot.
But how to do it ?
PS : exists clause is in place because I want the number of rows updated to be zero if the select clause returns zero rows.
JOIN the two tables instead of EXISTS. Something like the following:
UPDATE tab1
INNER JOIN tab2 ON --some join condition
SET sbd = --something
AND abc = --other something
WHERE --some conditions
you can use IN keyword
update tab1.abc,
tab1.sbd = (select tab2.abc, tab2.sbd from tab2,tab1 where --some conditions)
where something in
(select tab2.abc, tab2.sbd from tab2,tab1 where --some conditions)
refer below links:
IN (TSql)
SQL IN
Related
Using MariaDB
I am trying to update the membershipRenewDate(In officiantsDetails Table) using the MAX value from renewDate(in officiantsRenewals Table)
Inner Join on officiant_id (same column name for both tables)
I have something like this but am getting syntax error.
UPDATE officiantsDetails offd
SET offd.membershipRenewDate = offr.renewDate
FROM (SELECT TOP (1) renewDate, officiant_id FROM officiantsRenewals ORDER BY renewDate DESC ) as offr
WHERE offd.officiant_id = offr.officiant_id
You should be able to use a Common Table Expression (CTE) for this. You use the WITH clause to define your "subquery", and then INNER JOIN the CTE to the table you want to update. It would look something like this:
WITH Top1RenewDate AS
(
SELECT TOP (1)
renewDate,
officiant_id
FROM officiantsRenewals
ORDER BY renewDate DESC
)
UPDATE offd
SET offd.membershipRenewDate = offr.renewDate
FROM officiantsDetails offd
INNER JOIN Top1RenewDate offr ON offd.officiants_id = offr.officiants_id
This same syntax will also work for SQL Server, although you'd need to add a ; before the WITH keyword on that system.
The syntax you are using is not MariaDB. In MariaDB, you can use a JOIN:
UPDATE officiantsDetails offd JOIN
(SELECT renewDate, officiant_id
FROM officiantsRenewals
ORDER BY renewDate DESC
LIMIT 1
) offr
ON offd.officiant_id = offr.officiant_id
SET offd.membershipRenewDate = offr.renewDate;
The syntax you are using is more reminiscent of SQL Server.
This query returns the same row of data twice. Is there something wrong with my inner join? Or where clause?
SELECT
transaction_details.transaction_number,
transaction_details.transaction_id,
transaction_details.product_id,
Products3.ProductName
FROM
transaction_details
INNER JOIN
Products3 ON transaction_details.product_id = Products3.productID
INNER JOIN
transaction_status ON transaction_details.transaction_id = transaction_status.transaction_id
WHERE
transaction_details.transaction_id = 'tr-y9404'
AND status_of_transaction = 'pending'
Here is the output
You might have multiple entries in your table? In that case you can use SELECT DISTINCT. This will remove duplicates.
I haved saved SELECT query. I need create update query to update table field with value from saved select query.
Im getting error "Operation must use an updatable query".
Problem is that saved select query result not contain primary key.
UPDATE [table] INNER JOIN
[saved_select_query]
ON [table].id_field = [saved_select_query].[my_field]
SET [table].[target_field] = [saved_select_query]![source_field]);
Im also try with select subquery instead of inner join, but same error.
Perhaps a DLookUp() will do the trick:
UPDATE [table] SET
[target_field] = DLookUp("source_field", "saved_select_query", "my_field=" & id_field)
... or, if the joined field is text ...
UPDATE [table] SET
[target_field] = DLookUp("source_field", "saved_select_query", "my_field='" & id_field & "'")
I'm not sure I completely understand what you are asking.
If you are asking what syntax to use when performing an update with an inner join.
UPDATE tableAlias
SET Column = Value
FROM table1 as tableAlias
INNER JOIN table2 as table2Alias on tableAlias.key = table2Alias.key
your query is incorrect , try this.
UPDATE [table]
SET [table].[target_field] = [table2].
[source_field])
from (select *from
[table] INNER JOIN
[saved_select_query] a
ON [table].id_field =
a.[my_field] )
table2
I got it to work using the following:
UPDATE [table]
SET [table].[target_Field] = (SELECT [source_field] FROM [Saved_Select_Query]
WHERE [table].[id_field] = [Saved_Select_Query].[my_field])
You can't use an JOIN on an UPDATE statement directly, so you need to join the tables in a subquery.
this is the query to join 2 tables but I keep getting an error message near the JOIN
select CHKNBR, pidamt, copied_from_batdat, BATDAT, SEQNBR from UMCDTL
where copied_from_batdat between '10/11/2013' and '11/4/2013'
and batseq between '001' and '100' and SEQNBR between '01' and '100'
join
UMCFIL on BATDAT=SEQNBR and seqnbr=batadat
The output needs to display the
Original Claim Number
Original Paid Amount
Original Check Number
Thanks
If you want to use 'JOIN' specifically, then it needs to be inside of your 'FROM' clause.
Select...
From
table1 JOIN table2 ON Table1.key = Table2.key
Where...
If you want to use your 'WHERE' clause to join the tables, then relate the key fields there instead:
Select...
FROM
table1, table2
WHERE
table1.key = table2.key
...
Here's a tutorial on using the basic joins if want to understand it a little better: http://www.w3schools.com/sql/sql_join.asp
Try something like:
SELECT CHKNBR, pidamt, copied_from_batdat, BATDAT, SEQNBR
FROM UMCDTL JOIN UMCFIL ON BATDAT=SEQNBR AND seqnbr=batadat
WHERE copied_from_batdat between '10/11/2013' AND '11/4/2013'
AND batseq BETWEEN 1 AND 100
AND SEQNBR BETWEEN 1 AND 100
I have to update table test_test column "testconsent_id" with the id value of table test_groupedconsent, where the patient_id in test_test and patient_id in test_groupedconsent table match and
also creation_date in both table match.
I'm using the below query but getting error -- "near "as": syntax error".
what is wrong with the query?
Update test_test as Tinner join (select id,patient_id,creation_date from test_groupedconsent) as Aon A.patient_id = T.patient_id and A.creation_date = T.creation_dateset T.testconsent_id = A.id;
You cannot use a join directly in an UPDATE statement.
You have to use a correlated subquery to look up the desired value (in the subquery, you can do whatever you want, but in this case, you don't even need a join):
UPDATE test_test
SET testconsent_id = (SELECT id
FROM test_groupedconsent
WHERE patient_id = test_test.patient_id
AND creation_date = test_test.creation_date);
sounds like it took the 'as' after join for the joined tables so either put as in the (... as ...) or bring "ON COMMAND" before as!
like this -> (table1 join table2 on table1.fiel = table2.field) as something
UPDATE TABLE test_test
SET testconsent_id =
(SELECT testconsent_id FROM test_groupedconsent AS A, test_test AS B
WHERE A.patient_id = B.patient_id AND A.creation_date = B.A.creation_date)