请教pgsql的json解析类问题
yansheng836 opened this issue · comments
需求:(以查询or函数的方式)取json字段其中的数组的部分属性组成的数组,比如原来有3个属性,我只需要返回其中的2个即可(注:而且每层的数组的长度不定)。
ps: 因为之前用到的json相关的知识都比较少,内容也比较浅,因此遇到这种需求感觉难于下手,网络上找了挺久的资料,感觉好像都没有类似的解决方法。
借此平台想请教下各位大佬该如何处理,给个建议也行,比如该如何实现、能不能实现。
先谢过了。🌹
案例1:
字段数据:
[[{"key1": 8, "key2": 1, "key3": 1}, {"key1": 8, "key2": 1, "key3": 1}]]
即:
[
[
{
"key1": 8,
"key2": 1,
"key3": 1
},
{
"key1": 8,
"key2": 1,
"key3": 1
}
]
]
需要返回:
[[{"key1": 8, "key2": 1}, {"key1": 8, "key2": 1}]]
即:
[
[
{
"key1": 8,
"key2": 1
},
{
"key1": 8,
"key2": 1
}
]
]
案例2:
字段数据:
[[{"key1": 8, "key2": 1, "key3": 1}, {"key1": 8, "key2": 1, "key3": 1}],[{"key1": 8, "key2": 1, "key3": 1}]]
即:
[
[
{
"key1": 8,
"key2": 1,
"key3": 1
},
{
"key1": 8,
"key2": 1,
"key3": 1
}
],
[
{
"key1": 8,
"key2": 1,
"key3": 1
}
]
]
需要返回:
[[{"key1": 8, "key2": 1}, {"key1": 8, "key2": 1,}],[{"key1": 8, "key2": 1}]]
即:
[
[
{
"key1": 8,
"key2": 1
},
{
"key1": 8,
"key2": 1
}
],
[
{
"key1": 8,
"key2": 1
}
]
]
unnest json 去重后再组装