mySQL:当值x = ' '然后值y = 6时插入选择

Question

INSERT INTO Agent (agentID, agentName, locationID) 
SELECT DISTINCT pantodata.agentID, pantodata.agentName FROM pantodata
CASE
WHEN pantodata.AgentTown = 'Stirling' THEN locationID = 6 
WHEN pantodata.AgentTown = 'Dunblane' THEN locationID = 3
END
FROM pantodata

Pantodata table:
agentID  AgentName  AgentTown
100      John        Stirling
101      Jack        Dunblane

Location table:
locationID  City
1           Bannockburn
2           Dollar 
3           Dunblane
4           Falkirk
5           Menstrie
6           Stirling

Agent table:
agentID     agentName    locationID

我正在尝试将 pantodata 中的 agentID 和 pantodata 中的 agentName 插入到代理表中。然后，我尝试检查所述代理所在的城镇(来自 pantodata 表)，然后将 locationID(在代理表内)分配给某个数字，具体取决于他们来自 pantodata 表中指定的城镇。

Answer 1

查询中存在一些语法错误。尝试下面的更正版本。

INSERT INTO Agent (agentID, agentName, locationID) 
SELECT DISTINCT pantodata.agentID, pantodata.agentName,
CASE
WHEN pantodata.AgentTown = 'Stirling' THEN 6 
WHEN pantodata.AgentTown = 'Dunblane' THEN 3
END
FROM pantodata

使用位置表。这假设位置表中的 locationid 和 city 之间存在一对一关系。

INSERT INTO Agent (agentID, agentName, locationID) 
SELECT p.agentID, p.agentName, l.locationid
FROM pantodata p
JOIN Location l on p.AgentTown = l.city