Question

我需要从表A中获取值，表A，表A中的8行，并使用表A中每行的id来从表B和表C中获取数据，并将这些数据存储在一个数组中。

这就是我的意思：

Select id, name from table A --This returns 8 rows, which is the base table.

Select rate, review from table B --this returns 5 rows, and i store this 5 rows in an array and i append it to first row in table A

Select rate, review from table C --this returns 5 rows, and i store this 5 rows in an array and i append it to first row in table A

基本上，我正在做一个需要从两个不同的表中获取行的请求，并将其添加到该基表的第一行，因为我创建了8行基表。

当我将其作为json数据返回时，这就是它的外观：

"Rows": {
         "Rows0": {
             "ID": "524",
             "Name": "Value 1",
             "reviews": {
                 "name": "review for row value 0",
                 "timing": [
                     {
                         "day": "Sunday",
                         "Timing": "5:00PM"
                     },
                     {
                         "day": "Monday",
                         "Timing": "5:00PM"
                     },
                     {
                         "day": "Tuesday",
                         "Timing": "5:00PM"
                     }
                 ],
                 "day_showing": "Tuesday",
                 "recordid": "54570",
             }
         },
         "Rows1": {
             "ID": "789",
             "Name": "Value 1",
             "reviews": {
                 "name": "review for row value 1",
                 "timing": [
                     {
                         "day": "Sunday",
                         "Timing": "5:00PM"
                     },
                     {
                         "day": "Monday",
                         "Timing": "5:00PM"
                     },
                     {
                         "day": "Tuesday",
                         "Timing": "5:00PM"
                     }
                 ],
                 "day_showing": "Tuesday",
                 "recordid": "54570",
             }
         }
.....and more rows

我有没有办法使用连接，并在内部将这三个表连接在一起。这样我就不必遍历每一行并附加两个表，因为这段代码效率低下，当我返回第一行时，像8个不同的那样，8行被附加到第一行并从两个不同的表中作为数组返回。我需要有人帮助更多地了解这一点。我正在寻找最好的SQL代码构造，谢谢。

SQL连接在多个表中，并根据每一行进行连接

0 个答案: