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Linq to SQL | Get all records where a foreign key doesn't exist


Linq to SQL | Get all records where a foreign key doesn't exist

By : Imran Khan
Date : November 19 2020, 12:41 AM
will help you try this to achieve your goal, without join, just take elements that are not contained in Business_Hours table
code :
   var Schools = Db.Language_Schools
   .Where(s => !Db.Language_School_Business_Hours
   .Select(b => b.fk_school_id).ToList().Contains(s.pk_school_id))
   .Select(x => new
    {
        x.pk_school_id,
        x.school_title
   });


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Oracle/SQL - Finding records, if a similar doesnt exist, and joining on a 2nd table

Oracle/SQL - Finding records, if a similar doesnt exist, and joining on a 2nd table


By : mine wwe
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I'm trying to find all the distinct 'widget' names in my color table where the widget's color is 'red', but the widget doesn't also have certain other colors... say 'yellow' or 'blue' and the 'red' record has an edition of 'S'. , Using NOT IN
code :
SELECT w.widget 
     , w.description
     , w.weight
FROM widgets w 
  JOIN colors c
    ON w.widget = c.widget
WHERE c.color = 'red'
  AND c.edition = 'S'
  AND w.widget NOT IN 
  ( SELECT widget
    FROM colors
    WHERE color IN ('blue', yellow') 
  )
SELECT w.widget 
     , w.description
     , w.weight
FROM widgets w 
WHERE w.widget IN 
  ( SELECT widget
    FROM colors
    WHERE color IN ('red') 
      AND edition = 'S'
  )
  AND w.widget NOT IN 
  ( SELECT widget
    FROM colors
    WHERE color IN ('blue', yellow') 
  )
SELECT DISTINCT w.widget 
     , w.description
     , w.weight
FROM widgets w 
  JOIN colors c
    ON w.widget = c.widget
WHERE c.color = 'red'
  AND c.edition = 'S'
  AND NOT EXISTS 
  ( SELECT 1
    FROM colors c2
    WHERE w.widget = c2.widget
      AND c2.color IN ('blue', yellow') 
  )
SELECT w.widget 
     , w.description
     , w.weight
FROM widgets w 
  JOIN colors c
    ON w.widget = c.widget
GROUP BY w.widget
HAVING COUNT( color = 'red' 
              AND edition = 'S' ) >= 1
   AND COUNT( color = 'blue' ) = 0  
   AND COUNT( color = 'yellow' ) = 0
SELECT w.widget 
     , w.description
     , w.weight
FROM widgets w 
  JOIN 
  ( SELECT DISTINCT good.widget
    FROM colors good
      LEFT JOIN colors bad
        ON good.widget = bad.widget
          AND bad.color IN ('blue', yellow')
    WHERE good.color = 'red'
      AND good.edition = 'S'
      AND bad.widget IS NULL
  ) AS c
    ON w.widget = c.widget
How to show records which doesnt exist in mysql?

How to show records which doesnt exist in mysql?


By : Chelfree
Date : March 29 2020, 07:55 AM
This might help you Use NOT:
code :
select * from tabla where codigo NOT in (33,34,55,10,22,50); 
SELECT n.id
FROM
  (SELECT 33 AS codigo
   UNION SELECT 34
   UNION SELECT 55 
   UNION SELECT 10
   UNION SELECT 22 
   UNION SELECT 50) AS n
LEFT JOIN tabla USING (codigo)
WHERE tabla.codigo IS NULL;
SELECT nt.id
FROM numbers_table nt
LEFT JOIN tabla ON nt.id = tabla.codigo
WHERE nt.id IN (33,34,55,10,22,50)
  AND tabla.codigo IS NULL
Return records from a database if record doesnt exist in both tables? PDO

Return records from a database if record doesnt exist in both tables? PDO


By : priyanka
Date : March 29 2020, 07:55 AM
Does that help I have a bit of an issue I cant seem to figure out with google searching alone! , Here is one way using an OUTER JOIN:
code :
SELECT DISTINCT u.*
FROM users u
    LEFT JOIN user_friendships uf ON u.user_id = uf.user_followed_id
WHERE u.user_id <> ? 
   AND u.credits_offered <= credits_bank
   AND uf.user_followed_id IS NULL
INSERT to foreign table if it doesnt exist

INSERT to foreign table if it doesnt exist


By : Boaz.B
Date : March 29 2020, 07:55 AM
it fixes the issue After quite a bit of playing around, I settled on the answer from this stackoverflow post.
The answer is Function with UPSERT in Postgres 9.5 by @Erwin Brandstetter, what a great way of doing it! so impressive.
I need to return ALL records from Left Table Even if record doesnt exist in where clause

I need to return ALL records from Left Table Even if record doesnt exist in where clause


By : Golden Dolphin
Date : March 29 2020, 07:55 AM
will help you Hello I have two tables (Inventory and Sales). , Criteria on an outer joined table belongs in the ON clause:
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