inner-join – Page 3 – Tarik Billa

Performing Inner Join for Multiple Columns in the Same Table

May 11, 2023 by Tarik

This seems like the way to go: SELECT A.answer_id ,C1.color_name AS favorite_color_name ,C2.color_name AS least_favorite_color_name ,C3.color_name AS color_im_allergic_to_name FROM tbAnswers AS A INNER JOIN tbColors AS C1 ON A.favorite_color = C1.color_code INNER JOIN tbColors AS C2 ON A.least_favorite_color = C2.color_code INNER JOIN tbColors AS C3 ON A.color_im_allergic_to = C3.color_code Rather than “stupid”, I’d venture that … Read more

Opposite Of An Inner Join Query

April 22, 2023 by Tarik

Select * from table1 left join table2 on table1.id = table2.id where table2.id is null

Multiple INNER JOIN SQL ACCESS

April 15, 2023 by Tarik

Access requires parentheses in the FROM clause for queries which include more than one join. Try it this way … FROM ((tbl_employee INNER JOIN tbl_netpay ON tbl_employee.emp_id = tbl_netpay.emp_id) INNER JOIN tbl_gross ON tbl_employee.emp_id = tbl_gross.emp_ID) INNER JOIN tbl_tax ON tbl_employee.emp_id = tbl_tax.emp_ID; If possible, use the Access query designer to set up your joins. … Read more

Eliminating duplicate values based on only one column of the table

April 5, 2023 by Tarik

This is where the window function row_number() comes in handy: SELECT s.siteName, s.siteIP, h.date FROM sites s INNER JOIN (select h.*, row_number() over (partition by siteName order by date desc) as seqnum from history h ) h ON s.siteName = h.siteName and seqnum = 1 ORDER BY s.siteName, h.date

How do I convert multiple inner joins in SQL to LINQ?

March 31, 2023 by Tarik

Using query syntax: from c in dbo.Companies join p in dbo.Persons on c.AccountCoordinatorPersonId equals p.PersonId join p2 in dbo.Persons on c.AccountManagerPersonId equals p2.PersonId select new { c.CompanyId, c.CompanyName, AccountCoordinator = p.FirstName + ‘ ‘ + p.Surname, AccountManager = p2.FirstName + ‘ ‘ + p2.Surname } Using method chaining: dbo.Companies.Join(dbo.Persons, c => c.AccountCoordinatorPersonId, p => p.PersonId, … Read more

Insert using LEFT JOIN and INNER JOIN

March 29, 2023 by Tarik

You have to be specific about the columns you are selecting. If your user table had four columns id, name, username, opted_in you must select exactly those four columns from the query. The syntax looks like: INSERT INTO user (id, name, username, opted_in) SELECT id, name, username, opted_in FROM user LEFT JOIN user_permission AS userPerm … Read more

Update Query with INNER JOIN between tables in 2 different databases on 1 server

March 8, 2023 by Tarik

You could call it just style, but I prefer aliasing to improve readability. UPDATE A SET ControllingSalesRep = RA.SalesRepCode from DHE.dbo.tblAccounts A INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA ON A.AccountCode = RA.AccountCode For MySQL UPDATE DHE.dbo.tblAccounts A INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA ON A.AccountCode = RA.AccountCode SET A.ControllingSalesRep = RA.SalesRepCode