Home   Fees/Services   Access Templates   Tutorials   Tutorial Downloads   Articles   Search   Contact  Privacy  Links
SQL Self Join
SQL Self Join Query Examples
Home > Tutorials > Query Tutorials > Self Join Query
 






Query Tutorials Index:
Too Complex Query
Aggregate Query
Not In Operator
Choose Function
Crosstab Query
Date Time Query
SQL Delete Query
External Table Query
Report Filter Query
Group By Query
Having Query Clause
Histogram Query
Access Append Query
Master Detail Update
Order By Query
SQL Parameter Query
Predicate Query
Self Join Query
Scalar SubQuery
Master Detail Query
Select Query
Access SQL Select Top
SQL Union Query
SQL Update Query
Custom Query Function

 

MultiSelect Parameter Forms Access Tutorial


Self Join

SQL Self Join Example

Access self join:  In this update query example we use the self join query technique to update each employee's salary by 10%.  There are at least two ways to do this update. Example c) (below) is supposed to work but I get errors in Access.  It is called a correlated subquery - if you can tell me what is wrong with it I'd really appreciate it.



We have dozens of downloadable Access small business databases for you to learn and examine.

With our new partnership with Jay McCormick we have extensive programming support in SQL/Server database, MS Access software, Power BI applications, .Net web development, PHP, Excel & Outlook customization.



Self Join Query Code:

a)  Update M_Emp as A INNER JOIN M_Emp as B ON A.Emp_ID = B.Emp_ID SET A.Salary = B.Salary*1.1

b)  Update M_Emp as A, M_Emp as B Set A.Salary=B.Salary * 1.1
Where A.Emp_ID=B.Emp_ID

c)  Update M_Emp as A set A.Salary = (Select Salary * 1.1 from M_Emp Where M_Emp.Emp_ID = A.Emp_ID)

Note:  I have added a another feature to this self join query example - Aliases.  Aliases are where you use 'as' to establish a short nickname for a table or a field.  This alias feature helps when you have long table names or are trying to do a correlated subquery.

Additional One Table/Same Table Update Examples:

Self Join in Visual Basic Detail Master Update

Table Data in Access

Access Self Join Query for Inventory Calculations Example









A Blue Claw Software Design Template:

Contact Management Application
 









A Blue Claw Database Design Article:

Computer Disaster Recovery Planning
 









Blue Claw Database Design Downloadable Tutorial:
Choose Command Dynamic SQL Order By  








Microsoft Office:
MS Access 2000 Through Access 2016 & Office 365
 


Contact Information
Copyright 2000-2017 Blue Claw Database Design
Development in Microsoft Access, Microsoft SQL/Server and Azure

See our SQL/Server Development and Access Migration Tutorials