15個以上のサブクエリを解決する方法サブクエリは1行以上のエラーを返しますエラー

Question

SELECT et.*, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_waittime, 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_mode, 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_waittime, 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_mode, 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,2) AS leg3_waittime, 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,2) AS leg3_mode, 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,2) AS leg3_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,2) AS leg3_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,3) AS leg4_waittime, 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,3) AS leg4_mode, 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,3) AS leg4_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,3) AS leg4_fare 
FROM entitytrip as et 

Answer 1

最後の8つのサブクエリには1,2または1の制限がありますが、 3。あなたはより良いここ2,1 & 3,1

SELECT et.*, 
 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_waittime, 
 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_mode, 
 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_time, 
 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_fare, 
 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_waittime, 
 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_mode, 
 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_time, 
 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_fare, 
 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_waittime, 
 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_mode, 
 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_time, 
 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_fare, 
 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_waittime, 
 
(SELECT el.mode FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_mode, 
 
(SELECT el.time FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_time, 
 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_fare 
 
FROM entitytrip as et

Answer 2

SELECT et.*, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_waittime, 
(SELECT el.`mode` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_mode, 
(SELECT el.`time` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1) AS leg1_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_waittime, 
(SELECT el.`mode` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_mode, 
(SELECT el.`time` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 1,1) AS leg2_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_waittime, 
(SELECT el.`mode` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_mode, 
(SELECT el.`time` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 2,1) AS leg3_fare, 
(SELECT el.waitTime FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_waittime, 
(SELECT el.`mode` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_mode, 
(SELECT el.`time` FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_time, 
(SELECT el.fare FROM entityleg as el WHERE et.tripId=el.tripId LIMIT 3,1) AS leg4_fare 
FROM entitytrip as et 

に変更し修正されたコードがあるので、これらのサブクエリは複数の行を返します。 時間とモードは既にmysqlにあらかじめ定義されています。したがって、mysqlがカラム名として解釈するには、`時間`と`モード`を使用する必要があります。

また、制限とオフセットを間違って配置したため、「サブクエリが1行以上返します」というエラーが発生しました。limit 2,1の代わりにlimit 1,2を使用しました。同様にlimit 3,1を使用しましたlimit 1,3