我正在尝试连接两个表,其中表1从表2中提取值并将它们存储在单独的列中。描述情况:
Table 1
[ID][Name][TBL2_ID_Field1][TBL2_ID_Field2]
1 XYZ 3 4
Table 2
[ID][Type][Description1][Description2]
3 AA TEST TEST
4 BB TEST2 TEST2
我需要表格显示如下内容:
[ID][Name][TBL2_ID_Field1_DESC1][TBL2_ID_Field2_DESC1]
1 XYZ TEST TEST2
查询为......
SELECT tbl1.id, tbl1.name, tbl2.description1 as "tbl2_id_field1_desc1", tbl2.description1 as "tbl2_id_field2_desc1"
FROM Table1 tbl1, Table2 tbl2
WHERE tbl1.tbl2_id_field1 = table2.id
AND tbl1.tbl2_id_field2 = table2.id
显然不起作用,但我不确定还有什么可以尝试。
任何帮助表示赞赏!如果我没有说清楚,请告诉我。
答案 0 :(得分:2)
两次加入table2:
SELECT
tbl1.id,
tbl1.name,
tbl21.description1 as "tbl2_id_field1_desc1",
tbl22.description1 as "tbl2_id_field2_desc1"
FROM Table1 tbl1
JOIN Table2 tbl21 ON tbl21.id = tbl1.tbl2_id_field1
JOIN Table2 tbl22 ON tbl22.id = tbl1.tbl2_id_field2;