Filtering in a sQL select clause

Author: rprouse

Readme.md

@@ -11,11 +11,14 @@ I blog longer form posts on Retro-Computing at [8-Bit Labs](https://8bitlabs.ca/
 - [C#/CSharp](#ccsharp)
 - [Docker](#docker)
 - [Electronics](#electronics)
+- [Git](#git)
 - [NeoVim](#neovim)
 - [PowerShell](#powershell)
 - [Retro Computers](#retro-computers)
   - [Commodore 64](#commodore-64)
   - [CP/M](#cpm)
+- [SQL](#sql)
+- [TypeScript](#typescript)
 - [WSL](#wsl)
 - [WinGet](#winget)
 
@@ -28,17 +31,17 @@ I blog longer form posts on Retro-Computing at [8-Bit Labs](https://8bitlabs.ca/
 - [Running a Container](./docker/running-container.md)
 - [Attaching to a running container](./docker/attach-container.md)
 
+### Electronics
+
+- [SMD Resistor & Capacitor Sizes](./electronics/smd-resistors.md)
+
 ### Git
 
 - [Revert the Last Commit](./git/revert-last-commit.md)
 - [View commits on all branches for a user](./git/view-user-commits.md)
 - [Calculate Git commits by Author on all branches in C#](./csharp/git-commits.md)
 - [Format the oneline output](./git/format-output.md)
 
-### Electronics
-
-- [SMD Resistor & Capacitor Sizes](./electronics/smd-resistors.md)
-
 ### NeoVim
 
 - [Install NeoVim](./neovim/install-neovim.md)
@@ -61,6 +64,10 @@ I blog longer form posts on Retro-Computing at [8-Bit Labs](https://8bitlabs.ca/
 
 - [ZDE16](./retro/cpm/zde16.md)
 
+### SQL
+
+- [Counting in a SQL Select based on the Column Value](./sql/where-in-select.md)
+
 ### TypeScript
 
 - [Setup a Yarn Project with TypeScript in VS Code](./typescript/setup-yarn-with-ts.md)

sql/where-in-select.md

@@ -0,0 +1,13 @@
+# Counting in a SQL Select based on the Column Value
+
+I often want to count the number of a specify value in a column. I can do that in the `where` clause if it is only one value, but if I want to count more than one it doesn't work. Instead, you can filter in the `select` clause.
+
+```sql
+select Department,
+  count(case Position when 'Manager' then 1 else 0 end) as Managers,
+  count(case Position when 'Employee' then 1 else 0 end) as Employees,
+  count(case Position when 'Contractor' then 1 else 0 end) as Contractors
+from Employees
+group by Department
+order by Department
+```