所以我有2个MySQL表。
表NPC 表下载列表
我想要的是这个。
If
NPC.NPCID == DROPLIST.MOBID
THEN
DROPLIST.MOBNAME = NPC.NAME
这是我迄今为止所尝试的内容。
select npcid, name
from npc
join droplist on npc.npcid=droplist.mobId
where
case
when droplist.mobid = npc.npcid THEN droplist.mobname = npc.name
ELSE ''
END;
这会返回一些值，但实际上并没有改变或做任何事情。 这是它返回的内容。
+---------+-----------------------------------------+
| npcid | name |
+---------+-----------------------------------------+
| 40115 | Living Armor |
| 40118 | Elder |
| 45012 | Rabbit |
| 45021 | Deer |
| 45029 | Fungus |
| 45032 | Blob |
| 45058 | Wild Boar |
| 45077 | Stingray |
| 45100 | Betrayer's Skeleton Guardsman |
| 45119 | Orc Elder |
| 45154 | Mermaid |
| 45166 | Jack-O-Lantern |
| 45167 | Jack-O-Lantern |
| 45194 | Right-Hand Bandit |
| 45290 | Bats |
| 45292 | Corrupt Guard |
| 45300 | Ancient Apparition |
| 45301 | Sin of Sepia |
| 45302 | Giant Guardian |
| 45318 | Giant |
| 45342 | Mutant Giant Queen Ant |
| 45343 | Darkmar |
| 45413 | Diego |
| 45421 | Goblin of Ordeal |
| 45504 | Assassin Master |
| 45507 | Disciple of Death |
| 45618 | Knight Vald |
| 45670 | Lastabad Royal Guard |
| 45698 | Spirit of Ancient Person |
| 45699 | Spirit of Ancient Person |
| 45700 | Spirit of Ancient Person |
| 45701 | Spirit of Enraged Ancient Person |
| 45702 | Spirit of Enraged Ancient Person |
| 45703 | Spirit of Enraged Ancient Person |
| 45704 | Spirit of Enraged Ancient Person |
| 45705 | Creation of Varlok |
| 45706 | Creation of Varlok |
| 45707 | Creation of Varlok |
| 45708 | Creation of Varlok |
| 45709 | Varlok's Servant |
| 45737 | Goblin |
| 45775 | Polluted Deep Flower |
| 45782 | Polluted Great Spirit's Dirty Sycophant |
| 45784 | Polluted Great Spirit of Light |
| 45798 | Iron Golem of Maino Shaman |
| 45799 | Lava Golem of Maino Shaman |
| 45800 | Living Armor of Maino Shaman |
| 45804 | Vakuuk |
| 45813 | Mutant Merman |
| 45874 | Mutant Lizardman |
| 45875 | Skeletal Pirate Head |
| 45876 | Unknown 45876 |
| 45878 | Spirit of Drake |
| 45883 | Ribil |
| 45884 | Dedoff |
| 45885 | Ica |
| 45886 | Toad |
| 45887 | Rodeck |
| 45888 | Atushin |
| 45889 | Toda |
| 45890 | Oum |
| 45912 | Ghost Soldier Full of Resentment |
| 45913 | Ghost Soldier Full of Resentment |
| 45916 | General Hamel Full of Resentment |
| 45935 | Cursed Medusa |
| 45941 | Cursed Exorcist Saell |
| 46034 | Corrupted Zombie General |
| 46041 | Soul Devourer |
| 46119 | Ice Queen's Bow Guard |
| 46120 | Ice Queen's Guard |
| 46121 | Thebes Elder |
| 46124 | IndiGo's cold |
| 46125 | Iron Golem |
| 46126 | Lycanthrope |
| 46127 | Owlbear |
| 46128 | Snow Tiger |
| 46129 | SnowMan |
| 46130 | Snow Man |
| 46131 | Ghost |
| 46133 | Ice Golem |
| 46134 | Ice Man |
| 46153 | Snowman |
| 46154 | Snowman |
| 46155 | Ice Man |
| 46156 | Iron Golem |
| 46157 | Lycanthrope |
| 46158 | Owlbear |
| 46159 | Snow Tiger |
| 47712 | Giant Drake |
| 81043 | Wicked Yeti |
| 81067 | Black Knight |
| 81070 | Contaminated Orc Archer |
| 81071 | Contaminated Orc |
| 81072 | Contaminated Orc Warrior |
| 81073 | Polluted Orc Axe Fighter |
| 81074 | Contaminated Orc Spearman |
| 81108 | Zombie |
| 81109 | Skeleton |
| 99065 | Peer Ivoire |
| 100000 | Halloween Scarecrow |
| 100005 | Pajeon |
| 100006 | Coming |
| 100007 | Low vision |
| 100008 | Taro |
| 100009 | Horror(??) |
| 100010 | Sike |
| 100011 | Namur |
| 100012 | Gogam(??) |
| 100013 | Dog radeng(??) |
| 100014 | Yourself with |
| 100015 | Squid |
| 100016 | Cocoon(??) |
| 100017 | Racoon |
| 100019 | Bandit |
| 170832 | |
| 460308 | Corroded zombies |
| 777860 | Monster Birthday Cake |
| 4037001 | Faust |
| 4037001 | Faust |
| 4037001 | Faust |
| 4037001 | Faust |
| 4037001 | Faust |
| 4038003 | Coombe coma |
| 4038005 | Coombe coma |
| 4060005 | Fort Phantom of the system |
| 4060006 | Scorpion's Dreamland |
| 4060007 | Ruth Court of Dreamland |
| 4060008 | Mega Fantasy(??) |
| 4060009 | The Venetian's Phantom Boss |
| 4060010 | Medusa's Dreamland |
| 4060011 | Persephone Persephone's Dreamland |
| 4060012 | Via Dreamland |
| 4060013 | For the spirit of the wind |
| 4060014 | For water ordinance(??) |
| 4060015 | For the spirit of the land |
| 4060016 | Fire for spirits |
| 4070000 | Fiery Burning Warrior |
| 4070001 | Fiery Burning Archer |
| 4070003 | Fiery Fire Egg |
| 4070004 | Fiery Astagio |
| 4070005 | Firey Lava Golem |
| 4070006 | Fiery Phoenix |
| 4070007 | Venetian boss of Helong(??0 |
+---------+-----------------------------------------+
143 rows in set
非常感谢任何帮助！
答案 0 :(得分：0)
您需要使用realloc()
realloc()
UPDATE如果您想在JOIN中没有匹配时清空UPDATE droplist AS d
JOIN NPC as n ON n.NPCID = d.MOBID
SET d.mobName = n.Name
，请使用mobName：
NPC