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在MySql中,如何使用其父ID更新同一個表中的數據行?MySql使用同一個表的數據更新一行使用它的父ID
在下面的示例中,我試圖更新路徑id = 2
,路徑爲id = 1(因爲這是父級),並且名稱的值爲id = 2
。
我想要是無可救藥的錯誤:
update paths a
set path = (concat(select path from paths where id = parent,name))
where id = 2;
當前
"id" "parent" "path" "name"
"1" "0" "/us/software/" "microsoft"
"2" "1" "adobe"
預計
"id" "parent" "path" "name"
"1" "0" "/us/software/" "microsoft"
"2" "1" "/us/software/adobe" "adobe"
走路徑的值從它的父
您是否嘗試過分組的子查詢? 'UPDATE路徑SET path =(concat((從路徑中選擇路徑,其中id = parent),name))其中id = 2' – Jhn