Forum Discussion
Merge tables with multiple conditions in Power Query
Hi all, I'm trying to merge two tables a FACT Table and a DIM Table. It can easily be done in SQL with a LEFT JOIN, but was curious if there was a way to do this in Power Query. I am trying to pull values from the DIM table however the join is not on the Primary Key column but rather another column ,NumID, which contains duplicate values. Please let me know if more details are needed.
SQL Statement:
LEFT JOIN DIM ON DIM.NumID = FACT.CaseStatus AND DIM.Category = 'CaseStatus'
FACT Table
| CaseID | CaseStatus | CaseType | CaseTier | CaseOrigin |
| 1 | 1 | 1 | 1 | 1 |
| 2 | 2 | 2 | 2 | 2 |
| 3 | 3 | 3 | 3 | 3 |
DIM Table
| KEY | NumID | Category | Value |
| 1 | 1 | CaseStatus | Status1 |
| 2 | 2 | CaseStatus | Status2 |
| 3 | 3 | CaseStatus | Status3 |
| 4 | 1 | CaseType | Type1 |
| 5 | 2 | CaseType | Type2 |
| 6 | 3 | CaseType | Type3 |
Result:
FACT Table (After Merge)
| CaseID | CaseStatus | CaseType | CaseTier | CaseOrigin |
| 1 | Status1 | Type1 | Tier1 | Origin1 |
| 2 | Status2 | Type2 | Tier2 | Origin2 |
| 3 | Status3 | Type3 | Tier3 | Origin3 |
I think what you are looking for would be written like this in Power Query...
= Table.NestedJoin(#"Changed Type", {"CaseStatus"}, Table.SelectRows(#"DIM Table", each [Category] = "CaseStatus"), {"NumID"}, "DIM Table", JoinKind.LeftOuter)In this code there is a Left Outer join between the FACT Table 'CaseStatus' column (#"Changed Type" is the last step before the join in the FACT Table) and the DIM Table 'Num ID' column, The DIM Table is filtered to select rows that have Category = 'CaseStatus'.
2 Replies
I think what you are looking for would be written like this in Power Query...
= Table.NestedJoin(#"Changed Type", {"CaseStatus"}, Table.SelectRows(#"DIM Table", each [Category] = "CaseStatus"), {"NumID"}, "DIM Table", JoinKind.LeftOuter)In this code there is a Left Outer join between the FACT Table 'CaseStatus' column (#"Changed Type" is the last step before the join in the FACT Table) and the DIM Table 'Num ID' column, The DIM Table is filtered to select rows that have Category = 'CaseStatus'.