DB/Creature: Remove model from creature table if not needed

Closes #24822

(cherry picked from commit 2211610ff75dfb712bb49fc41ebcc4e7d92394ae)

1 files changed, 25 insertions, 0 deletions

diff --git a/sql/updates/world/master/2022_01_18_07_world_2020_06_26_06_world.sql b/sql/updates/world/master/2022_01_18_07_world_2020_06_26_06_world.sql
new file mode 100644
index 00000000000..9ad0b083530
--- /dev/null
+++ b/sql/updates/world/master/2022_01_18_07_world_2020_06_26_06_world.sql
@@ -0,0 +1,25 @@
+--
+-- set creature.modelid to 0 if creature only has a single model defined in creature_template_model and that model matches value in creature table
+CREATE TEMPORARY TABLE creature_guids_with_unique_model SELECT
+  c.guid 
+FROM
+  `creature` c
+  INNER JOIN (
+  SELECT
+    ctm.CreatureDisplayID AS CreatureDisplayID,
+    ctm.CreatureID AS CreatureID 
+  FROM
+    creature_template_model ctm 
+  GROUP BY
+    ctm.CreatureID 
+  HAVING
+    COUNT(ctm.CreatureDisplayID) = 1 
+  ) uniq_models ON c.id = uniq_models.CreatureID 
+  AND c.modelid = uniq_models.CreatureDisplayID;
+
+UPDATE `creature` SET `modelid`=0 WHERE `guid` IN (SELECT * FROM creature_guids_with_unique_model);
+
+-- UPDATE `creature` a LEFT JOIN `creature_template` b ON a.`id` = b.`entry` SET `modelid` = 0 WHERE a.`id` IN (SELECT b.`entry` FROM `creature_template` WHERE b.`modelid1` != 0 AND b.`modelid2` = 0 AND b.`modelid3` = 0 AND b.`modelid4` = 0) AND a.`modelid` = b.`modelid1`;
+-- UPDATE `creature` a LEFT JOIN `creature_template` b ON a.`id` = b.`entry` SET `modelid` = 0 WHERE a.`id` IN (SELECT b.`entry` FROM `creature_template` WHERE b.`modelid1` = 0 AND b.`modelid2` != 0 AND b.`modelid3` = 0 AND b.`modelid4` = 0) AND a.`modelid` = b.`modelid2`;
+-- UPDATE `creature` a LEFT JOIN `creature_template` b ON a.`id` = b.`entry` SET `modelid` = 0 WHERE a.`id` IN (SELECT b.`entry` FROM `creature_template` WHERE b.`modelid1` != 0 AND b.`modelid2` != 0 AND b.`modelid3` != 0 AND b.`modelid4` != 0) AND (a.`modelid` = b.`modelid1` OR a.`modelid` = b.`modelid2` OR a.`modelid` = b.`modelid3` OR a.`modelid` = b.`modelid4`);
+UPDATE `creature` SET `modelid` = 0 WHERE `id`=1505;