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Selecting from two tables, limiting by the first


Selecting from two tables, limiting by the first

By : user2950473
Date : November 17 2020, 11:55 AM
will help you I've been looking for the solution for several days, and I'm starting to feel like a real idiot. , I got what I wanted with,
code :
SELECT *
FROM (
    SELECT date AS date
    FROM entries
    ORDER BY date DESC
    LIMIT 4
) AS ent, link
WHERE ent.date = link.date
2014-01-04 tag4
2014-01-04 tag2
2014-01-03 tag1
2014-01-02 tag2
2014-01-02 tag1
2014-01-01 tag3
2014-01-01 tag2
2014-01-01 tag1


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Database Design: Selecting and limiting Favorites

Database Design: Selecting and limiting Favorites


By : user2623529
Date : March 29 2020, 07:55 AM
this one helps. The question has been answered, however, since you are seeking understanding ...
The idea with Databases is that all such such limits and Constraints on data are placed in the Database itself (as a self-contained unit). Data COnstraints should be in the Database, not only in the app. ISO/IEC/ANSI SQL provide several types of Constraints, for different purposes:
Selecting with UNION but limiting every subquery and receiving distinct values

Selecting with UNION but limiting every subquery and receiving distinct values


By : Jongy Assasin
Date : March 29 2020, 07:55 AM
To fix this issue I have a table and want to get 15 values with one order and 15 with another order. The aim is getting exactly 30 distinct values. , If necessary, replace "id" with the name of your primary key:
code :
(SELECT * FROM table1 WHERE criteria ORDER BY views DESC LIMIT 15)
UNION
(SELECT * FROM table1 WHERE criteria AND id NOT IN(SELECT id FROM table1 WHERE criteria LIMIT 15) ORDER BY date_upload DESC LIMIT 15)
MySQL; limiting records from one table when selecting from three

MySQL; limiting records from one table when selecting from three


By : Nishant
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Assuming upload date is unique for a person, use a sub query to get the latest photo date for each person and join that against the photos table:-
code :
SELECT * 
FROM persons
INNER JOIN personcategorylookup ON personcategorylookup.personUID = persons.uID
INNER JOIN 
(
    SELECT personUID, MAX(uploadDate) AS latest_photo_date
    FROM photos 
    GROUP BY personUID
) sub0
ON sub0.personUID = persons.uID
INNER JOIN photos ON sub0.personUID = photos.personUID AND sub0.latest_photo_date = photos.uploadDate
WHERE personcategorylookup.categoryUID = 1
Selecting fields and limiting total results in MongoDB query (Meteor)

Selecting fields and limiting total results in MongoDB query (Meteor)


By : edzon delion
Date : March 29 2020, 07:55 AM
it should still fix some issue find() has 2 parameters, you're providing 3 in your first example. try this:
code :
const users = Meteor.users.find(
  {
    'roles.__global_roles__': {$in: ['myRole']},
    $and: query
  },
  {fields: {
    username: 1,
    firstName: 1,
    lastName: 1,
    update: 1
  },
    limit: 2,
    sort: {'update.any': -1}
  }
).fetch();
Limiting/Aggregating Results When Selecting on an ID followed by a CASE

Limiting/Aggregating Results When Selecting on an ID followed by a CASE


By : user3200432
Date : March 29 2020, 07:55 AM
Hope that helps Trying to pull some data from a Log table. , You gotta do the CTE's or self joins it should look like that
code :
WITH CTE1 AS (
SELECT TYPE_ID,
       CASE WHEN LogOperation = 'Insert' THEN CreateDT ELSE NULL END AS create_date
FROM TypeLOG
), CTE2 (
SELECT TYPE_ID,
       CASE WHEN (AuditID > 0 OR AuditID IS NOT NULL) AND OldVal_AuditID IS NULL THEN LogTimeStamp ELSE NULL END AS audit_date
FROM TypeLOG
)
    SELECT CTE1.TYPE_ID, CREATE_DATE, AUDIT_DATE
    FROM CTE1 JOIN CTE2 
    ON CTE1.TYPE_ID = CTE2.TYPE_ID
    ORDER BY TYPE_ID
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