From b50b8af303c2b6713887e5e13bb4ec5dcff9ac85 Mon Sep 17 00:00:00 2001
From: Mark Reid <mreid@mozilla.com>
Date: Tue, 6 May 2025 20:50:24 -0300
Subject: [PATCH] Update sql_style.md

Add guidance around placement of commas
---
 src/concepts/sql_style.md | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/concepts/sql_style.md b/src/concepts/sql_style.md
index d36e86892..6281cb1c9 100644
--- a/src/concepts/sql_style.md
+++ b/src/concepts/sql_style.md
@@ -368,6 +368,41 @@ WHERE
   sample_id = '42'
 ```
 
+## Comma at the End of the Line
+
+Commas between `SELECT` elements should always be at the end of the line.
+For example:
+
+**Good**
+
+```sql
+SELECT
+  client_id,
+  os_name,
+  submission_date
+FROM
+  main_summary
+WHERE
+  submission_date > '20180101'
+LIMIT
+  10
+```
+
+**Bad**
+
+```sql
+SELECT
+  client_id
+  , os_name
+  , submission_date
+FROM
+  main_summary
+WHERE
+  submission_date > '20180101'
+LIMIT
+  10
+```
+
 ## Nested Queries
 
 Do not use nested queries.