From 8d8fa78bee65825ce5033b1d21fd67b09f12baca Mon Sep 17 00:00:00 2001
From: Aarol D'Souza <98270103+AarDG10@users.noreply.github.com>
Date: Sun, 4 Jan 2026 10:18:53 +0530
Subject: [PATCH] fix(postgres): add pg compatible query for copying comm_date
 from comm to comm_link (#35488)

---
 .../copy_communication_date_to_link.py        | 34 +++++++++++++------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/frappe/core/doctype/communication_link/patches/copy_communication_date_to_link.py b/frappe/core/doctype/communication_link/patches/copy_communication_date_to_link.py
index 0a6cd1ee5e..563acd8f8d 100644
--- a/frappe/core/doctype/communication_link/patches/copy_communication_date_to_link.py
+++ b/frappe/core/doctype/communication_link/patches/copy_communication_date_to_link.py
@@ -6,18 +6,32 @@ def execute():
 	batch_size = 10_000
 
 	while True:
-		frappe.db.sql(
-			"""
-			update `tabCommunication Link` cl
-			inner join `tabCommunication` c on cl.parent = c.name
-			set cl.communication_date = c.communication_date
-			where cl.communication_date is null
-			and c.communication_date is not null
-			limit %s
-			""",
+		frappe.db.multisql(
+			{
+				"mariadb": """
+					update `tabCommunication Link` cl
+					inner join `tabCommunication` c on cl.parent = c.name
+					set cl.communication_date = c.communication_date
+					where cl.communication_date is null
+					and c.communication_date is not null
+					limit %s
+				""",
+				"postgres": """
+					UPDATE "tabCommunication Link"
+					SET communication_date = sub.communication_date
+					FROM (
+						SELECT cl.name, c.communication_date
+						FROM "tabCommunication Link" cl
+						JOIN "tabCommunication" c ON cl.parent = c.name
+						WHERE cl.communication_date IS NULL
+						AND c.communication_date IS NOT NULL
+						LIMIT %s
+					) AS sub
+					WHERE "tabCommunication Link".name = sub.name
+				""",
+			},
 			(batch_size,),
 		)
-
 		frappe.db.commit()
 
 		if not frappe.db.sql(