I am trying to keep this to the minimal table queries to ensure less database usage. I am using Microsoft SQL Server Management Server.
I have a query which will sometimes return nothing depending on the user's current status. If this first query does not return any results, I would like the second query to run.
This is inside of a function and requires returning a single row of column data. I will include the queries with names changed for an example. I will do my own optimization after to make a temp table so the database is not accessed as often. I just need to figure out how to make this work first.
-- Query #1
INSERT #tlbReturn (returnInfo1, returnInfo2)
SELECT TOP(1) returnInfo1, returnInfo2
FROM table1 AS t1a
INNER JOIN table1 AS t1b ON t1a.someData1 = t1b.someData1
AND t1a.someData2 = t1b.someData2
AND t1a.someData3 = t1b.someData3
AND t1a.someData4 = t1b.someData4
INNER JOIN table2 AS t2 ON t2.someData6 = t1b.someData7
AND t2.someData8 = t1b.someData9
WHERE t1a.someData10 = 'value'
AND t1b.someData11 IN ('value1', 'value2')
ORDER BY t1b.someDate DESC;
-- Query #2
INSERT #tlbReturn (returnInfo1, returnInfo2)
SELECT TOP(1) returnInfo1, returnInfo2
FROM table1 AS t1a
INNER JOIN table1 AS t1b ON t1a.someData1 = t1b.someData1
AND t1a.someData5 = t1b.someData5
INNER JOIN table2 AS t2 ON t2.someData6 = t1b.someData7
AND t2.someData8 = t1b.someData9
WHERE t1a.someData10 = 'value'
AND t1b.someData11 IN ('value1', 'value2')
ORDER BY t1b.someDate DESC;
In theory I would like something like,
IF EXISTS(QUERY1) THEN RETURN
ELSE RETURN QUERY2
Check the value of ##ROWCOUNT after the first query.
Do a first select, check ##ROWCOUNT and if it's a zero do a second select
Related
I'm trying to update historicTable (8k records containing employee data) when 2 IDs match (one company id and the other area id) with the tempTable, which is a temporary table with the data I want to update (SUBG_ROT), else (the column stays empty), it should copy data from colx to coly from the same historic table. I was thinking of a JOIN/INNER JOIN but I can't get the structure at all, so I did a stored procedure with a conditional update, but I can't figure out how to call the temporary table. Any hints on the logic/code are appreciated, I'm starting on SQL Server so I'm kinda clueless.
In my mind the code should do:
Update historicTable set SUBG when h.id1 = t.id1 and h.id2 = t.id2 then h.SUBG = t.SUBG else h.id1 = h.SUBG
And this is the code
CREATE PROCEDURE updateHistoric
AS
UPDATE dbo.historicTable
SET SUBG_ROT = CASE
WHEN id1 = temptable.id1 AND id2 = temptable.id2
THEN SUBG_ROT = temptable.SUBG_ROT
ELSE SUBG_ROT = AREA
END
GO
You can try using OUTER APPLY like follownig.
UPDATE t
SET t.subg_rot = CASE
WHEN o.subg_rot IS NOT NULL THEN o.subg_rot
WHEN t.subg_rot IS null then t.area
ELSE t.subg_rot
END
FROM dbo.historictable t
OUTER APPLY (SELECT TOP 1 subg_rot
FROM temptable t2
WHERE t1.id1 = t2.id1
AND t1.id2 = t2.id2)o
Note: Same thing is also possible using LEFT JOIN or sub queries.
I am trying to use a case statement with sub query in a Update statement but I am facing an Issue like
single-row sub query returns more than
Please find my Query which I tried
update r_gl.ac
set meeting_cost = case currency_code when 'IND'
then amount
else round(tgt.amount)
from r_gl.ac tgt
join
(
select distinct
a.frm_cur,
a.to_cur,
a.exch_rate
from b_gl.currncy_conv_dim a
join r_gl.ac b
on (a.frm_cur = 123 and a.to_cur = b.cur_cd and f_rate = 'ABC')
join b_gl.int_fg
on b.in_s=c.in_s and a.cal_sk = trunc(c.intact_dt_key,-2)
) src
on tgt.cur_cd=src.to_cur
)
end
Please help me to solve this issue
Your current CASE expression is missing its END. That aside, I see even bigger problems with your UPDATE statement. Redshift is based on an old version of Postgres, and hence I expect that it would adhere to the same syntax Postgres would use for an update join:
UPDATE table1 AS t1
SET some_column = t2.some_other_column
FROM table2 AS t2
WHERE t1.id = t2.id
Applying this syntax to your current query along with the fix for the CASE expression leaves us with the following:
update r_gl.ac tgt
set meeting_cost = case when currency_code = 'IND'
then tgt.amount
else round(tgt.amount) end
from
(
select distinct
a.frm_cur,
a.to_cur,
a.exch_rate
from b_gl.currncy_conv_dim a
inner join r_gl.ac b
on (a.frm_cur = 123 and a.to_cur = b.cur_cd and f_rate = 'ABC')
inner join b_gl.int_fg
on b.in_s=c.in_s and a.cal_sk = trunc(c.intact_dt_key,-2)
) src
where tgt.cur_cd = src.to_cur
The table to which you are joining r_gl.ac has no effect on the data being used to update, but rather would only affect the update by targeting certain rows. If this be not your intended logic, then you might have to rethink the entire query.
What would the syntax be to convert this MS Access query to run in SQL Server as it doesn't have a DistinctRow keyword
UPDATE DISTINCTROW [MyTable]
INNER JOIN [AnotherTable] ON ([MyTable].J5BINB = [AnotherTable].GKBINB)
AND ([MyTable].J5BHNB = [AnotherTable].GKBHNB)
AND ([MyTable].J5BDCD = [AnotherTable].GKBDCD)
SET [AnotherTable].TessereCorso = [MyTable].[J5F7NR];
DISTINCTROW [MyTable] removes duplicate MyTable entries from the results. Example:
select distinctrow items
items.item_number, items.name
from items
join orders on orders.item_id = items.id;
In spite of the join getting you the same item_number and name multiple times when there is more than one order for it, DISTINCTROW reduces this to one row per item. So the whole join is merely for assuring that you only select items for which exist at least one order. You don't find DISTINCTROW in any other DBMS as far as I know. Probably because it is not needed. When checking for existence, we use EXISTS of course (or IN for that matter).
You are joining MyTable and AnotherTable and expect for some reason to get the same MyTable record multifold for one AnotherTable record, so you use DISTINCTROW to only get it once. Your query would (hopefully) fail if you got two different MyTable records for one AnotherTable record.
What the update does is:
update anothertable
set tesserecorso = (select top 1 j5f7nr from mytable where mytable.j5binb = anothertable.gkbinb and ...)
where exists (select * from mytable where mytable.j5binb = anothertable.gkbinb and ...)
But this uses about the same subquery twice. So we'd want to update from a query instead.
The easiest way to get one result record per <some columns> in a standard SQL query is to aggregate data:
select *
from anothertable a
join
(
select j5binb, j5bhnb, j5bdcd, max(j5f7nr) as j5f7nr
from mytable
group by j5binb, j5bhnb, j5bdcd
) m on m.j5binb = a.gkbinb and m.j5bhnb = a.gkbhnb and m.j5bdcd = a.gkbdcd;
How to write an updateble query is different from one DBMS to another. Here is the final update statement for SQL-Server:
update a
set a.tesserecorso = m.j5f7nr
from anothertable a
join
(
select j5binb, j5bhnb, j5bdcd, max(j5f7nr) as j5f7nr
from mytable
group by j5binb, j5bhnb, j5bdcd
) m on m.j5binb = a.gkbinb and m.j5bhnb = a.gkbhnb and m.j5bdcd = a.gkbdcd;
The DISTINCTROW predicate in MS Access SQL removes duplicates across all fields of a table in join statements and not just the selected fields of query (which DISTINCT in practically all SQL dialects do). So consider selecting all fields in a derived table with DISTINCT predicate:
UPDATE [AnotherTable]
SET [AnotherTable].TessereCorso = main.[J5F7NR]
FROM
(SELECT DISTINCT m.* FROM [MyTable] m) As main
INNER JOIN [AnotherTable]
ON (main.J5BINB = [AnotherTable].GKBINB)
AND (main.J5BHNB = [AnotherTable].GKBHNB)
AND (main.J5BDCD = [AnotherTable].GKBDCD)
Another variant of the query.. (Too lazy to get the original tables).
But like the query above updates 35 rows =, so does this one
UPDATE [Albi-Anagrafe-Associati]
SET
[Albi-Anagrafe-Associati].CRegDitte = [055- Registri ditte].[CRegDitte],
[Albi-Anagrafe-Associati].NIscrTribunale = [055- Registri ditte].[NIscrTribunale],
[Albi-Anagrafe-Associati].NRegImprese = [055- Registri ditte].[NRegImprese]
FROM [055- Registri ditte]
WHERE EXISTS(
SELECT *
FROM [055- Registri ditte]-- [Albi-Anagrafe-Associati]
WHERE ([055- Registri ditte].GIBINB = [Albi-Anagrafe-Associati].GKBINB)
AND ([055- Registri ditte].GIBHNB = [Albi-Anagrafe-Associati].GKBHNB)
AND ([055- Registri ditte].GIBDCD = [Albi-Anagrafe-Associati].GKBDCD))
Update [AnotherTable]
Set [AnotherTable].TessereCorso = MyTable.[J5F7NR]
From [AnotherTable]
Inner Join
(
Select Distinct [J5BINB],[5BHNB],[J5BDCD]
,(Select Top 1 [J5F7NR] From MyTable) as [J5F7NR]
,[J5BHNB]
From MyTable
)as MyTable
On (MyTable.J5BINB = [AnotherTable].GKBINB)
AND (MyTable.J5BHNB = [AnotherTable].GKBHNB)
AND (MyTable.J5BDCD = [AnotherTable].GKBDCD)
How Do I set multiple AND conditions?
ex.
SELECT *
FROM CONFIRMED
WHERE NOT EXISTS
(
SELECT *
FROM Import_Orders
WHERE Import_Orders.Customer = CONFIRMED.Customer
AND Import_Orders.Reference = CONFIRMED.Reference
AND Import_Orders.[Index] = CONFIRMED.[Index]
AND Import_Orders.QuantityToDeliver = CONFIRMED.QuantityToDeliver
AND Import_Orders.DateToDeliver = CONFIRMED.DateToDeliver
);
I know this works on my tables with one WHERE & AND condition but not with several.
I Need a result of two tables where the above conditions do not match. I do not have identical keys in the two tables. Now with this code I get all the results that are in table CONFIRMED.
Here is the syntax for multiple tables:
WHERE NOT EXISTS (...) AND NOT EXISTS (...) AND NOT EXISTS (...)
However, if the database is so large that you care about performance, you'll need a much less obvious syntax along the following lines:
LEFT JOIN Some_Table t ON (t.xxx = Main_Table.xxx)
LEFT JOIN Another_Table t2 ON (t2.xxx = Main_Table.xxx)
LEFT JOIN Yet_Another_Table t3 ON (t3.xxx = Main_Table.xxx)
...
WHERE t.id IS NULL AND t2.id IS NULL AND t3.id IS NULL
For one table and one composed condition, like in the SQL sample in your question:
LEFT JOIN Some_Table t ON
t.xxx = Main_Table.xxx
AND t.yyy = Main_Table.yyy
AND t.zzz = Main_Table.zzz
WHERE t.id IS NULL
This is expected to return rows that exist in Main_Table but do not have matching rows in Some_Table, assuming the columns xxx, etc., are non-nullable.
If, for example, xxx is nullable, here is how you need to modify the query further:
LEFT JOIN Some_Table t ON
(t.xxx = Main_Table.xxx OR (t.xxx IS NULL AND Main_Table.xxx IS NULL))
AND t.yyy = Main_Table.yyy
AND t.zzz = Main_Table.zzz
WHERE t.id IS NULL
I am guessing that you have an ID on Import_Orders, if not use any field name that is turning up empty on the query. You would be better using field names rather than *. I have added an example for Import_Orders.
SELECT CONFIRMED.*, Import_Orders.ID, Import_Orders.Customer
FROM CONFIRMED
LEFT JOIN Import_Orders
ON Import_Orders.Customer = CONFIRMED.Customer
AND Import_Orders.Reference = CONFIRMED.Reference
AND Import_Orders.[Index] = CONFIRMED.[Index]
AND Import_Orders.QuantityToDeliver = CONFIRMED.QuantityToDeliver
AND Import_Orders.DateToDeliver = CONFIRMED.DateToDeliver
WHERE Import_Orders.ID Is Null
More information
Fundamental Microsoft Jet SQL for Access 2000
Intermediate Microsoft Jet SQL for Access 2000
Advanced Microsoft Jet SQL for Access 2000
You could just replace all the "=" with "<>" and you should get all the results that don't have a match on all criteria.
SELECT *
FROM CONFIRMED
WHERE EXISTS
(
SELECT *
FROM Import_Orders
WHERE Import_Orders.Customer <> CONFIRMED.Customer
AND Import_Orders.Reference <> CONFIRMED.Reference
AND Import_Orders.[Index] <> CONFIRMED.[Index]
AND Import_Orders.QuantityToDeliver <> CONFIRMED.QuantityToDeliver
AND Import_Orders.DateToDeliver <> CONFIRMED.DateToDeliver
);
I have a table where I wish to update some of the rows. All the fields are not null. I'm doing a sub-query, and I wish to update the table with the non-Null results.
See Below for my final answer:
In MySQL, I solve this problem by doing an UPDATE IGNORE. How do I make this work in SQL Server 2005? The sub-query uses a four-table Join to find the data to insert if it exists. The Update is being run against a table that could have 90,000+ records, so I need a solution that uses SQL, rather than having the Java program that's querying the database retrieve the results and then update those fields where we've got non-Null values.
Update: My query:
UPDATE #SearchResults SET geneSymbol = (
SELECT TOP 1 symbol.name FROM
GeneSymbol AS symbol JOIN GeneConnector AS geneJoin
ON symbol.id = geneJoin.geneSymbolID
JOIN Result AS sSeq ON geneJoin.sSeqID = sSeq.id
JOIN IndelConnector AS joiner ON joiner.sSeqID = sSeq.id
WHERE joiner.indelID = #SearchResults.id ORDER BY symbol.id ASC)
WHERE isSNV = 0
If I add "AND symbol.name IS NOT NULL" to either WHERE I get a SQL error. If I run it as is I get "adding null to a non-null column" errors. :-(
Thank you all, I ended up finding this:
UPDATE #SearchResults SET geneSymbol =
ISNULL ((SELECT TOP 1 symbol.name FROM
GeneSymbol AS symbol JOIN GeneConnector AS geneJoin
ON symbol.id = geneJoin.geneSymbolID
JOIN Result AS sSeq ON geneJoin.sSeqID = sSeq.id
JOIN IndelConnector AS joiner ON joiner.sSeqID = sSeq.id
WHERE joiner.indelID = #SearchResults.id ORDER BY symbol.id ASC), ' ')
WHERE isSNV = 0
While it would be better not to do anything in the null case (so I'm going to try to understand the other answers, and see if they're faster) setting the null cases to a blank answer also works, and that's what this does.
Note: Wrapping the ISNULL (...) with () leads to really obscure (and wrong) errors.
with UpdatedGenesDS (
select joiner.indelID, name, row_number() over (order by symbol.id asc) seq
from
GeneSymbol AS symbol JOIN GeneConnector AS geneJoin
ON symbol.id = geneJoin.geneSymbolID
JOIN Result AS sSeq ON geneJoin.sSeqID = sSeq.id
JOIN IndelConnector AS joiner ON joiner.sSeqID = sSeq.id
WHERE name is not null ORDER BY symbol.id ASC
)
update Genes
set geneSymbol = upd.name
from #SearchResults a
inner join UpdateGenesDs upd on a.id = b.intelID
where upd.seq =1 and isSNV = 0
this handles the null completely as all are filtered out by the where predicate (can also be filtered by join predicate if You wish. Is it what You are looking for?
Here's another option, where only those rows in #SearchResults that are succesfully joined will be udpated. If there are no null values in the underlying data, then the inner joins will pull in no null values, and you won't have to worry about filtering them out.
UPDATE #SearchResults
set geneSymbol = symbol.name
from #SearchResults sr
inner join IndelConnector AS joiner
on joiner.indelID = sr.id
inner join Result AS sSeq
on sSeq.id = joiner.sSeqID
inner join GeneConnector AS geneJoin
on geneJoin.sSeqID = sSeq.id
-- Get "lowest" (i.e. first if listed alphabetically) value of name for each id
inner join (select id, min(name) name
from GeneSymbol
group by id) symbol
on symbol.id = geneJoin.geneSymbolID
where isSNV = 0 -- Which table is this value from?
(There might be some syntax problems, without tables I can't debug it)