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How do I perform a JOIN if one of multiple conditions is true?


How do I perform a JOIN if one of multiple conditions is true?

By : Mikalai Sheliah
Date : November 17 2020, 11:55 AM
like below fixes the issue If the individual joins work fast, the composite OR condition is probably slow because it cannot use a single index whereas the individual conditions can each use a single index for the three joining conditions. Because it can't use one index, it is probably doing non-indexed sequential table scans. (You should study the query plan so you understand what the optimizer is actually doing.)
Given that the individual queries work reasonably fast, therefore, you should get dramatically better performance using UNION (unless the optimizer in your DBMS has a blind spot):
code :
SELECT qry1.* FROM qry1 INNER JOIN tbl2 ON qry1.CellPhone = tbl2.CellPhone
UNION
SELECT qry1.* FROM qry1 INNER JOIN tbl2 ON qry1.HomePhone = tbl2.HomePhone
UNION
SELECT qry1.* FROM qry1 INNER JOIN tbl2 ON qry1.WorkPhone = tbl2.WorkPhone


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LINQ; How to perform left outer join with multiple conditions?

LINQ; How to perform left outer join with multiple conditions?


By : Thịnh Vượng House
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further It seems this answer was what I was looking for.
code :
from ledgers in ledgerEntries
join currency in currencyExchange
    on ledgers.CurrencyCode equals currency.CurrencyCode
        into c
from currencies in c.Where(currency => currency.StartingDate <= ledgers.DocumentDate 
&& currency.EndingDate <= ledgers.DocumentDate).DefaultIfEmpty()
from ledgers in ledgerEntries
from currencies in currencyExchange.Where(
    currency => currency.CurrencyCode == ledgers.CurrencyCode
    && currency.StartingDate <= ledgers.DocumentDate 
    && currency.EndingDate <= ledgers.DocumentDate).DefaultIfEmpty()
Select row from left join table where multiple conditions are true

Select row from left join table where multiple conditions are true


By : user3139745
Date : March 29 2020, 07:55 AM
I hope this helps you . I recommend you take one step back and consider this problem without the join. You want to know which rows are related to both properties 3 and 5. You can do that without the join like this:
code :
SELECT tab1ID
FROM table2
WHERE propertyID = 3 OR propertyID = 5
GROUP BY tab1ID
HAVING COUNT(*) = 2;
SELECT t1.name
FROM table1 t1
JOIN table2 t2 ON t2.tab1ID = t1.id
WHERE t2.propertyid = 3 OR t2.propertyid = 5
GROUP BY t1.id
HAVING COUNT(*) = 2;
I need jQuery to perform a task if two conditions are true

I need jQuery to perform a task if two conditions are true


By : Brave-Boy
Date : March 29 2020, 07:55 AM
will help you You can check the combination of class and Attribute Equals Selector [name="value"]
code :
if($('li.menuactive[data-menuid="0033"]').length){
    //Your code to change the logo
}
var listMeetingCondition = $('li').filter(function(){
    return $(this).hasClass('menuactive') && $(this).attr('data-menuid') == "0033"
});

if(listMeetingCondition.length){
    //Your code to change the logo
}
Angular 1: multiple conditions with multiple conditions OR how to exclude conditions if other conditions are true

Angular 1: multiple conditions with multiple conditions OR how to exclude conditions if other conditions are true


By : Uhrovat
Date : March 29 2020, 07:55 AM
To fix the issue you can do Right now I have created an extra span to hold one condition. , Is this what you're looking for?
code :
(key < 4 || viewMore) && (wWidth > 568 || subKey == 0)
Join two tables - multiple conditions. Subsequent conditions to be used if not joined by prior conditions

Join two tables - multiple conditions. Subsequent conditions to be used if not joined by prior conditions


By : kraven
Date : March 29 2020, 07:55 AM
help you fix your problem I am trying to build a join logic of two tables where I need to have a joining condition picked if in a manner ‘join by column 1, if not joined - by column 2, if not joined - by column 3’. I am having trouble building it in a simple way. , You can try like this:
code :
select p.productId, p.brandName, c.contractId 
from Products p left join Contracts c on
(p.productId = c.productId or p.productId=c.brand);
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