Concatenate Location

Example Data

Table1 (Table1):

BPLId	DocNum
1	101
1	102
2	103

 

Table2 (Table2):

BPLId	LocCode
1	A
1	B
1	C
2	X
2	Y

 

Result:

BPLId	DocNum	ConcatenatedLocCodes
1	101	A, B, C
1	102	A, B, C
2	103	X, Y

In PostgreSQL, you can use the STRING_AGG function.

SELECT 
    t1.BPLId,
    t1.DocNum,
    STRING_AGG(t2.LocCode, ', ' ORDER BY t2.LocCode) AS ConcatenatedLocCodes
FROM 
    Table1 t1
JOIN 
    Table2 t2
ON 
    t1.BPLId = t2.BPLId
GROUP BY 
    t1.BPLId, t1.DocNum;

• STRING_AGG is used to concatenate LocCode values with a specified delimiter (', ').
• The ORDER BY clause inside STRING_AGG ensures the concatenated values are sorted.

In SQL Server, you can use the STRING_AGG function (introduced in SQL Server 2017) or FOR XML PATH for older versions.

Using STRING_AGG (SQL Server 2017+):

SELECT 
    t1.BPLId,
    t1.DocNum,
    STRING_AGG(t2.LocCode, ', ') WITHIN GROUP (ORDER BY t2.LocCode) AS ConcatenatedLocCodes
FROM 
    Table1 t1
JOIN 
    Table2 t2
ON 
    t1.BPLId = t2.BPLId
GROUP BY 
    t1.BPLId, t1.DocNum;

Using FOR XML PATH (Older Versions):

SELECT 
    t1.BPLId,
    t1.DocNum,
    STUFF((
        SELECT ', ' + t2.LocCode
        FROM Table2 t2
        WHERE t1.BPLId = t2.BPLId
        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '') AS ConcatenatedLocCodes
FROM 
    Table1 t1
GROUP BY 
    t1.BPLId, t1.DocNum;

• STUFF removes the leading delimiter (, ) from the concatenated string.
• FOR XML PATH('') is used to concatenate values into a single string.

To achieve this, you can use a combination of SQL JOIN and string aggregation functions (like GROUP_CONCAT in MySQL or STRING_AGG in PostgreSQL/SQL Server).

1. Join the two tables based on the matching BPLId.
2. Group the records by DocNum and concatenate the LocCode values for each group.

In MySQL, you can use the GROUP_CONCAT function to concatenate values.

SELECT 
    t1.BPLId,
    t1.DocNum,
    GROUP_CONCAT(t2.LocCode ORDER BY t2.LocCode SEPARATOR ', ') AS ConcatenatedLocCodes
FROM 
    Table1 t1
JOIN 
    Table2 t2
ON 
    t1.BPLId = t2.BPLId
GROUP BY 
    t1.BPLId, t1.DocNum;

 

• t1 represents the first table (Table1) with BPLId and DocNum.
• t2 represents the second table (Table2) with BPLId and LocCode.
• The JOIN ensures that only rows with matching BPLId in both tables are considered.
• GROUP_CONCAT concatenates the LocCode values for each DocNum group.
• ORDER BY t2.LocCode ensures the concatenated values are sorted alphabetically.
• SEPARATOR ', ' specifies the delimiter between concatenated values.

Let's consider you have two tables:

• Table1 with fields BPLId and DocNum
• Table2 with fields BPLId, DocNum, and LocCode

You want to concatenate the LocCode field from Table2 for records with the same BPLId and DocNum.

Here's how you can do it:

SELECT 
    t1.BPLId,
    t1.DocNum,
    STRING_AGG(t2.LocCode, ', ') AS ConcatenatedLocCodes
FROM 
    Table1 t1
JOIN 
    Table2 t2 ON t1.BPLId = t2.BPLId AND t1.DocNum = t2.DocNum
GROUP BY 
    t1.BPLId, t1.DocNum;

Explanation:

• JOIN: Combines rows from Table1 and Table2 where BPLId and DocNum match.
• STRING_AGG: Concatenates the LocCode values from Table2 into a single string, separated by commas.
• GROUP BY: Groups the results by BPLId and DocNum.

If you are using MySQL, you can use GROUP_CONCAT instead:

SELECT 
    t1.BPLId,
    t1.DocNum,
    GROUP_CONCAT(t2.LocCode SEPARATOR ', ') AS ConcatenatedLocCodes
FROM 
    Table1 t1
JOIN 
    Table2 t2 ON t1.BPLId = t2.BPLId AND t1.DocNum = t2.DocNum
GROUP BY 
    t1.BPLId, t1.DocNum;