I have this:
->select('COUNT(x)')->setMaxResults(null)->setFirstResult(0)->getQuery()->getSingleScalarResult();
this works as long as I dont have join. If I have left join, it will also count the duplicated left-columns. How to prevent that?
You can do that by grouping:
$qb->select('COUNT(x)')
->leftJoin('x.another_table', 'a')
->groupBy('x.id')
->setMaxResults(null)
->setFirstResult(0)
->getQuery()
->getSingleScalarResult();
Related
Update: I've updated the test string to cover a case that I've missed.
I'm trying to do count the number of WHERE filters in a query using regex.
So the general idea is to count the number of WHERE and AND occuring in the query, while excluding the AND that happens after a JOIN and before a WHERE. And also excluding the AND that happens in a CASE WHEN clause.
For example, this query:
WITH cte AS (\nSELECT a,b\nFROM something\nWHERE a>10\n AND b<5)\n, cte2 AS (\n SELECT c,\nd FROM another\nWHERE c>10\nAND d<5)\n SELECT CASE WHEN c1.a=1\nAND c2.c=1 THEN 'yes' ELSE 'no' \nEND,c1.a,c1.b,c2.c,c2.d\nFROM cte c1\nINNER JOIN cte2 c2 ON c1.a = c2.c\nAND c1.b = c2.d\nWHERE c1.a<4 AND DATE(c1)>'2022-01-01'\nAND c2.c>6
-- FORMATTED FOR EASE OF READ. PLEASE USE LINE ABOVE AS REGEX TEST STRING
WITH cte AS (
SELECT a,b
FROM something
WHERE a>10
AND b<5
)
, cte2 AS (
SELECT c,d
FROM another
WHERE c>10
AND d<5
)
SELECT
CASE
WHEN c1.a=1 AND c2.c=1 THEN 'yes'
WHEN c1.a=1 AND c2.c=1 THEN 'maybe'
ELSE 'no'
END,
c1.a,
c1.b,
c2.c,
c2.d
FROM cte c1
INNER JOIN cte2 c2
ON c1.a = c2.c
AND c1.b = c2.d
WHERE c1.a<4
AND DATE(c1)>'2022-01-01'
AND c2.c>6
should return 7, which are:
WHERE a>10
AND b<5
WHERE c>10
AND d<5
WHERE c1.a<4
AND DATE(c1)>'2022-01-01'
AND c2.c>6
The portion AND c1.b = c2.d is not counted because it happens after JOIN, before WHERE.
The portion AND c2.c=1 is not counted because it is in a CASE WHEN clause.
I eventually plan to use this on a Postgresql query to count the number of filters that happens in all queries in a certain period.
I've tried searching around for answer and trying it myself but to no avail. Hence looking for help here. Thank you in advanced!
I try to stay away from lookarounds as they could be messy and too painful to use, especially with the fixed-width limitation of lookbehind assertion.
My proposed solution is to capture all scenarios in different groups, and then select only the group of interest. The undesired scenarios will still be matched, but will not be selected.
Group 1 - Starts with JOIN (undesired)
Group 2 - Starts with WHERE (desired)
Group 3 - Starts with CASE (undesired)
(JOIN.*?(?=$|WHERE|JOIN|CASE|END))|(WHERE.*?(?=$|WHERE|JOIN|CASE|END))|(CASE.*?(?=$|WHERE|JOIN|CASE|END))
Note: Feel free to replace WHERE|JOIN|CASE|END to any keyword you want to be the 'stopper' words.
All scenarios including the undesired ones will be matched, but you need to select only Group 2 (highlighted in orange).
You can try something like this:
WITH DataSource (parts) AS
(
SELECT REGEXP_MATCHES(
'WITH cte AS (SELECT a,b FROM something WHERE a>10 AND b<5)\n, cte2 AS (SELECT c,d FROM another WHERE c>10 AND d<5)\n SELECT c1.a,c1.b,c2.c,c2.d FROM cte c1 INNER JOIN cte2 c2 ON c1.a = c2.c AND c1.b = c2.d WHERE c1.a<4 AND c2.c>6',
E'(?= WHERE)[^)|;]+'
,'gmi'
)
)
SELECT SUM
(
(length(parts[1]) - length(REPLACE(parts[1], 'AND', ''))) / 3 -- counting ANDs
+ 1 -- for the where
)
FROM DataSource
The idea is to match the text after WHERE clause:
and then simply count the ANDs and add one because of the matched WHERE.
I have a column tags containing ids in a comma separated list.
I want to search all rows where a given value is in that column.
Say I have two rows where the column tags looks like this:
Row1: 1,2,3,4
Row2: 2,5,3,12
and I want to search for a row where the column contains a 1. I try to do it this way:
$qb = $this->createQueryBuilder('p')
->where(':value IN (p.tags))
->setParameter('value', 1);
I expect it to do something like
SELECT p.* FROM mytable AS p WHERE 1 IN (p.tags)
Executing this in MySQL directly works perfectly. In Doctrine it does not work:
Error: Expected Literal, got 'p'
It works the other way around, though, but this is not what I need:
->where("p.tags IN :value")
I've tried a lot to make this work, but it just won't... Any ideas?
I think you should use the LIKE function for each scenario, as example:
$q = "1";
$qb = $this->createQueryBuilder('p')
->andWhere(
$this->expr()->orX(
$this->expr()->like('p.tags', $this->expr()->literal($q.',%')), // Start with...
$this->expr()->like('p.tags', $this->expr()->literal('%,'.$q.',%')), // In the middle...
$this->expr()->like('p.tags', $this->expr()->literal('%,'.$q)), // End with...
),
);
See the SQL statement result in this fiddle
Hope this help
I got a code that uses a lot of left join with many tables. When I run this code, it takes more than an hour to run and at the end it gives error with Sort Execution Failure. So, I am thinking of breaking down that left join in multiple steps but I am not sure how to do it and need your help.
The code is as:
Proc sql;
create table newlib.Final_test as
SELECT
POpener.Name as Client,
Popener.PartyId as Account_Number,
Case
When BalLoc.ConvertedRefNo NE '' then BalLoc.ConvertedRefNo
else BalLoc.Ourreferencenum
End as LC_Number,
BalLoc.OurReferenceNum ,
BalLoc.CnvLiabilityCode as Liability_Code,
POfficer.PartyID as Officer_Num,
POfficer.Name as Officer_Name,
POpener.ExpenseCode,
BalLoc.IssueDate as Issue_Date format=mmddyy10.,
BalLoc.ExpirationDate AS Expiry format=mmddyy10.,
BalLoc.LiabilityAmountBase as Total_LC_Balance,
Case
When BalLoc.Syndicated = 0 Then BalLoc.LiabilityAmountBase
else 0
End as SunTrust_Non_Syndicated_Exposure,
Case
When BalLoc.Syndicated = 1 and BalLoc.PartOutGroupPkey NE 0 Then
BalLoc.LiabilityAmountBase
else 0
End as SunTrust_Syndicated_Exposure,
Case
When BalLoc.Syndicated = 1 and BalLoc.PartOutGroupPkey NE 0 Then
(BalLoc.LiabilityAmountBase - (BalLoc.LiabilityAmountBase *
(PParty.ParticipationPercent/100)))
Else BalLoc.LiabilityAmountBase
End as SunTrust_Exposure,
Case
When BalLoc.Syndicated = 1 and BalLoc.PartOutGroupPkey <> 0 Then
(BalLoc.LiabilityAmountBase * PParty.ParticipationPercent/100)
Else 0
End as Exposure_Held_By_Other_Banks,
PBene.Name as Beneficiary_Trustee,
cat(put(input(POpener.ObligorNumber,best10.),z10.),put(input
(BalLoc.CommitmentNumber,best10.),Z10.)) as Key,
case
when BalLoc.BeneCusip2 NE ' ' then catx
('|',Balloc.BeneCusip,Balloc.BeneCusip2)
else BalLoc.BeneCusip
End as Cusip,
Case
when balLoc.OKtoExpire = 1 then '0'
when balLOc.OKtoExpire=0 and BalLoc.AutoExtTermDays NE 0 then put
(Balloc.AutoExtTermDays,z3.)
when balLoc.OKtoExpire=0 and BalLoc.AutoExtTermsMonth NE 0 then put
(balloc.AutoExtTermsMonth,z3.)
else '000'
End as Evergreen
Case
when blf.AnnualRate NE 0 then put(blf.AnnualRate,z7.)
when blf.Amount NE 0 then cats('F',put(blf.amount,z7.))
else 'WAIVE'
End as Pricing,
FROM BalLocPrimary BalLoc
Left JOIN Party POpener on POpener.Pkey = BalLoc.OpenerPkey
Left join PartGroup PGroup on BallOC.PartOutGroupPkey = PGroup.pKey
Left join PartParties PParty ON PGroup.pKey = PParty.PartGroupPkey and
PParty.ParticipationPercent > 0 and
PParty.combined in
(select PPartParties.All_combined
from PPartParties /*group by PartGroupPkey, PartyPkey*/)
Left Join MemExpenseCodes ExpCodes on POpener.ExpenseCode = ExpCodes.Code
Left JOIN Party PBene on PBene.Pkey = BalLoc.BenePkey
Left join Party POfficer on POfficer.Pkey = BalLoc.AccountOfficerPkey
left join maxfee on maxfee.LocPrimaryPkey = BalLoc.LocPrimaryPkey
left join BalLocFee BLF on BLF.Pkey = maxfee.pkey
Where BalLoc.LetterType not in ('STBA','EXPA', 'FEE',' ') and
BalLoc.LiabilityAmountBase > 0 and BalLoc.irdb = 1
;
quit;
Thank you,
Shankar
A few things I would suggest:
1, for each dataset that you reference, keep only the variables you need to join on, or which get used in the SELECT statement. E.g., from your Party dset, it looks like you only need the Pkey field and Name. Therefore when you make your join to that dset, you should use:
Left JOIN Party(keep=Pkey Name) PBene on PBene.Pkey = BalLoc.BenePkey
2, Push your WHERE statement into the FROM statement like so:
FROM BalLocPrimary(where=(LetterType not in ('STBA','EXPA', 'FEE',' ') and
LiabilityAmountBase > 0 and irdb = 1)) BalLoc
And make sure the conditions are in the order of most common to least (barring any index that might be on those 3 fields)
3, You are driving off the BalLocPrimary dataset, left joining to everything else. Is that what you really intend? Is it OK that your result set comes back without a Client or Account_Number? Left Joins can be computationally expensive, and the more you can minimize them, the better.
4, Joe asked about indexes on the join fields. You probably should have some. I have found myself referencing this SUGI paper regularly enough to bookmark it. Similarly, you could review the EXPLAIN PLAN from the query to see where it might be bottlenecking. Another SUGI paper would be a good start.
5, You're right that this could (should?) be broken up into multiple steps. That's a good intuition. However the optimal breaks are going to be highly depending on the underlying data, index, and the join paths. So it's hard to prescribe that from the other side of the screen. I think that second paper I linked could give you some good tips on optimization for your specific case.
I have a database filled with some codes like
EE789323
990
78000
These numbers are ALWAYS endings of a larger code. Now I have a function that needs to check if the larger code contains the subcode.
So if I have codes 90 and 990 and my full code is EX888990, it should match both of them.
However I need to do it in the following way:
SELECT * FROM tableWithRecordsWithSubcode
WHERE subcode MATCHES [reg exp with full code];
Is a regular expression like this this even possible?
EDIT:
To clarify the issue I'm having, I'm not using SQL here. I just used that to give an example of the type of query I'm using.
In fact I'm using iOS with CoreData, and I need a predicate to fetch me only the records that match.
In the way that is mentioned below.
Given the observations from a comment:
Do you have two tables, one called tableWithRecordsWithSubcode and another that might be tableWithFullCodeColumn? So the matching condition is in part a join - you need to know which subcodes match any of the full codes in the second table? But you're only interested in the information in the tableWithRecordsWithSubcode table, not in which rows it matches in the other table?
and the laconic "you're correct" response, then we have to rewrite the query somewhat.
SELECT DISTINCT S.*
FROM tableWithRecordsWithSubcode AS S
JOIN tableWithFullCodeColumn AS F
ON F.Fullcode ...ends-with... S.Subcode
or maybe using an EXISTS sub-query:
SELECT S.*
FROM tableWithRecordsWithSubcode AS S
WHERE EXISTS(SELECT * FROM tableWithFullCodeColumn AS F
WHERE F.Fullcode ...ends-with... S.Subcode)
This uses a correlated sub-query but avoids the DISTINCT operation; it may mean the optimizer can work more efficiently.
That just leaves the magical 'X ...ends-with... T' operator to be defined. One possible way to do that is with LENGTH and SUBSTR. However, SUBSTR does not behave the same way in all DBMS, so you may have to tinker with this (possibly adding a third argument, LENGTH(s.subcode)):
LENGTH(f.fullcode) >= LENGTH(s.subcode) AND
SUBSTR(f.fullcode, LENGTH(f.fullcode) - LENGTH(s.subcode)) = s.subcode
This leads to two possible formulations:
SELECT DISTINCT S.*
FROM tableWithRecordsWithSubcode AS S
JOIN tableWithFullCodeColumn AS F
ON LENGTH(F.Fullcode) >= LENGTH(S.Subcode)
AND SUBSTR(F.Fullcode, LENGTH(F.Fullcode) - LENGTH(S.Subcode)) = S.Subcode;
and
SELECT S.*
FROM tableWithRecordsWithSubcode AS S
WHERE EXISTS(
SELECT * FROM tableWithFullCodeColumn AS F
WHERE LENGTH(F.Fullcode) >= LENGTH(S.Subcode)
AND SUBSTR(F.Fullcode, LENGTH(F.Fullcode) - LENGTH(S.Subcode)) = S.Subcode);
This is not going to be a fast operation; joins on computed results such as required by this query seldom are.
I'm not sure why you think that you need a regular expression... Just use the charindex function:
select something
from table
where charindex(code, subcode) <> 0
Edit:
To find strings at the end, you can create a pattern with the % wildcard from the subcode:
select something
from table
where '%' + subcode like code
I have come across this multiple times in the past, and I just ended up writing a raw SQL query to overcome it, but I really want to find out why this is happening. Look at the statement below
$q = $this->entityManager->createQuery('SELECT um,s,st
FROM Dashboard\Entity\Metric um
JOIN um.stat st
JOIN um.site s
JOIN s.clients c
WHERE c.id = ?1
AND s.competitor = 0
AND s.ignored = 0
AND st.id IN (?2)
GROUP BY s.id, st.id
ORDER BY st.response_field, s.id')
->setParameter(1, $params['c_id'])
->setParameter(2, $statId);
$sql = $q->getSql();
$rs = $q->getResult();
If I take the contents of $sql and paste them into a mySQL tool and run the raw query, it returns 18 results which is correct.
However, $rs only contains 3 results. $statId is a comma-separated string of 6 numbers: (1,2,3,4,5,6). So I am grouping by st.id, and s.id. There will be 3 s.id elements for every st.id element, working out to the 18 results I expected. What's happening is Doctrine is only returning the first st.id which is the group of 3 s.id 's
Any idea what could be causing this?
I got my answer from IRC, but posting here in case it helps someone else. Smart WHERE IN statements aren't planned for support until 2.1 version.
http://groups.google.com/group/doctrine-dev/browse_thread/thread/fbf70837293676fb
But I can accomplish the same goal with query builder.
http://www.doctrine-project.org/docs/orm/2.0/en/reference/query-builder.html