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Inner Join Query with 2 tables giving different result compared to Sub Query for same 2 tables Northwind database


By : Duzy Zulkarnain
Date : October 16 2020, 06:10 AM
around this issue The difference here is what you're returning. In the subquery example, you are returning just the rows from the Customers table who have orders in the subquery - so a row per customer. In the inner join example, you are returning data from both the Customers and the Orders table - so a row per customer and per order.
If a customer has 5 orders, the subquery example will return a single row - for the customer. In the inner join example, the query will return 5 rows - one for every order the customer has made.
code :


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inner join query of two tables not giving exact result


By : Joseph V J
Date : March 29 2020, 07:55 AM
To fix this issue Your select() function is wrong ,second parameter of select is for escaping ,first parameter contains the list of columns in select statement
code :
$this->db->select('AV.Title,AV.Description,AV.Price,AV.Created_Date,','AMP.Title,AMP.Description,AMP.Price,AMP.Created_Date')
                                                                     ^^^^ here
$this->db->select('AV.Title,AV.Description,AV.Price,AV.Created_Date,AMP.Title,AMP.Description,AMP.Price,AMP.Created_Date')
$this->db->select('
AV.Title,
AV.Description,
AV.Price,
AV.Created_Date,
AMP.Title AS AMPTitle,
AMP.Description AS AMPDescription,
AMP.Price AS  AMPPrice,
AMP.Created_Date AS AMPCreated_Date'
)

Northwind database JOIN QUERY between three tables (many to many)


By : Cynthia Huang
Date : March 29 2020, 07:55 AM
This might help you First, we assume the every Order has a Customer, so if an Employee has an Order, he must also have a Customer. So, we can forget about the Customer Table. We really just want to know, Which Employees have Orders. For that, we look at the Orders and gather a list of Employees that own them:
code :
  (from o in Orders
  select o.Employee).Distinct()

Why is my join query not giving the expected result for three tables


By : Mast Pelluri
Date : March 29 2020, 07:55 AM
I wish this help you Below query can solve your problem
SELECT u.*,GROUP_CONCAT(distinct uskill.skills) skills from jobs_applied_by_jobseeker_for_employer jbs Left join user_details u on u.user_id = jbs.employee_id left join user_skills uskill on u.user_id = uskill.user_id group by u.user_id

JPA Criteria Query - How to implement Join on two tables to get desired result in single Query


By : hosein
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can add a fetch type eager instructions on your relation, and the ForwardPower will be load with LoadProfile with any LoadProfile.find
code :
  @OneToOne(fetch=FetchType.EAGER)
  @JoinColumns({
      @JoinColumn(name = "dataId", insertable = false, updatable = false, referencedColumnName = "dataId"),
      @JoinColumn(name = "occurrenceTime", insertable = false, updatable = false, referencedColumnName = "occurrenceTime")
  })
  private ForwardPower forwardPower;
//instead of loadProfileRoot.join(LoadProfile_.forwardPower)
Join<LoadProfile, ForwardPower> join = (Join<LoadProfile, ForwardPower>) loadProfileRoot.fetch(LoadProfile_.forwardPower);

SQL query to join multiple tables based upon separate query result


By : Antares
Date : March 29 2020, 07:55 AM
around this issue I am trying to find the right SQL query to join multiple tables together based upon a separate query.. , It should just be a simple multi-level join
code :
SELECT TitleName, HardwareName, SoftwareName
FROM Titles
INNER JOIN Titles_Hardware
ON Titles.TitleId = Titles_Hardware.TitleId
INNER JOIN Titles_Software
ON Titles.TitleId = Titles_Software.TitleId
INNER JOIN Hardware
ON Hardware.HardwareId = Titles_Hardware.HardwareId
INNER JOIN Software
ON Software.SoftwareId = Titles_Software.SoftwareId
WHERE Titles.TitleId = {something}
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