我有一组简单的三个表。 2个“源”表和一个允许一对多关系的“联接”表。
我有这个查询:
select data.mph1.data ->> 'name' as name,data.mph1.data ->> 'tags' as Tags,data.mph2.data ->> 'School' as school from data.mph1
join data.mph1tomph2 on data.mph1tomph2.mph1 = data.mph1.id
join data.mph2 on data.mph2.id = data.mph1tomph2.mph2
输出显示为:
Name Tags School
"Steve Jones" "["tag1","tag2"]" "UMass"
"Steve Jones" "["tag1","tag2"]" "Harvard"
"Gary Summers" "["java","postgres","flutter"]" "Yale"
"Gary Summers" "["java","flutter"]" "Harvard"
"Gary Summers" "["java","flutter"]" "UMass"
我正在寻找的是
Name Tags School
"Steve Jones" "["tag1","tag2"]" "UMass","Harvard"
"Gary Summers" "["java","flutter"]" "Yale,Harvard,UMass"
如何在单个查询中得到此结果?可能吗?