Visualizing Types Of Joins

Kevin Feasel

2018-02-19

Syntax

Daniel Hutmacher has a nice PDF cheat sheet showing different types of joins:

How it works: For each join example, there are two tables, the left and the right table, shown as two columns. For the sake of simplicity, these tables are called “a” and “b” respectively in the code.

You’ll notice that the sheet uses a kind of pseudo-code when it comes to table names and column names.

Click through for the PDF.  I appreciate that he did not use Venn diagrams, as those should be saved for Union/Intersect/Except.

Related Posts

Pitfalls with Window Functions

Itzik Ben-Gan takes us through two issues you might run into when using window functions: There are two common pitfalls involving window functions, both of which are the result of counterintuitive implicit defaults that are imposed by the SQL standard. One pitfall has to do with calculations of running totals where you get a window […]

Read More

The If Statement and Friends in Powershell

Kevin Marquette explains what is possible with if in Powershell: The -not operator flips an expression from $false to $true or from $true to $false. Here is an example where we want to perform an action when Test-Path is $false. if ( -not ( Test-Path -Path $path ) ) There’s plenty of good stuff here, so check it out.

Read More

Categories

February 2018
MTWTFSS
« Jan Mar »
 1234
567891011
12131415161718
19202122232425
262728