我有一个这样的表，我试图将行汇总成一行。有没有办法在SQL中做到这一点，我能想到的唯一方法就是在同一个表上自我连接上做一堆
答案 0 :(得分：1)
您可以enrollments": [
[
{
"subject": {
"assigner": "2.16.840.1.113883.3.3519.6.1.32",
"value": "5"
},
"identifiers": [
{
"value": "52",
"assigner": "2.16.840.1.113883.3.3519.6.1.32"
}
],
"_id": "5b1981dfac3d5a000fb92fc3",
"progressNotes": [],
"id": "5b1981dfac3d5a000fb92fc3"
},
{
"subject": {
"assigner": "2.16.840.1.113883.3.3519.6.1.32",
"value": "5"
},
"identifiers": [
{
"value": "7",
"assigner": "2.16.840.1.113883.3.3519.6.1.32"
}
],
"_id": "5b1981dfac3d5a000fb92fc2",
"progressNotes": [],
}
],
"id": "5b1981dfac3d5a000fb92fc2"
}
]
],
ID，并获取每列的group by值。
max()