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How to use full-text search across multiple tables, SQL Server 2005

I have a full text directory with two tables in it.

tableA has 4 columns (a1, a2, a3, a4) out of 3 indexed in the directory, a2, a3, a4. a1 is the primary key.

tableB has 3 columns (b1, b2, b3, b4), two of which are indexed in the directory, b3 and b4. b1 is the PK of this table, b2 is the FK for tableA.

I want to do something like

SELECT *, (ftTableA.[RANK] + ftTableB.[RANK]) AS total_rank 
FROM tableA
INNER JOIN tableB ON tableA.a1=tableB.b2
INNER JOIN FREETEXTTABLE(tableA, (a2,a3,a4), 'search term') as ftTableA ON tableA.a1=ftTableA.[KEY]
INNER JOIN FREETEXTTABLE(tableB, (b3,b4), 'search term') as ftTableB ON tableB.11=ftTableB.[KEY]

But this does not work ... I can make one table work, for example.

SELECT *, (ftTableA.[RANK] + ftTableB.[RANK]) AS total_rank 
FROM tableA
INNER JOIN FREETEXTTABLE(tableA, (a2,a3,a4), 'search term') as ftTableA ON tableA.a1=ftTableA.[KEY]

but not more than one table.

Can someone give an explanation and / or example of the steps required for full-text search across multiple tables.

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2 answers

, A B .

, .

LEFT OUTER :

SELECT *, (ISNULL(ftTableA.[RANK], 0) + ISNULL(ftTableB.[RANK], 0)) AS total_rank 


WHERE ftTableA.Key IS NOT NULL OR ftTableB.Key IS NOT NULL
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, , . , A, . , A TableB.

, , 3 .

DECLARE @Results Table (a1 Int UNIQUE, Rank Int)

--Insert into @Results all matching items from TableA
INSERT INTO @Results
(a1, Rank)
( SELECT TableA.a1, FT.Rank
FROM TableA INNER JOIN FreeTextTable(TableA, *, 'search term') FT
ON TableA.A1 = FT.[Key]
)

--Update all of the ranks in @Results with a sum of current value plus the sum of
--all sub items (in TableB)
UPDATE @Results
SET Rank = RS.Rank + FT.Rank
FROM @Results RS INNER JOIN TableB
ON RS.A1 = TableB.b2
INNER JOIN FreeTextTable(TableB, *, 'search term') FT
ON TableB.b1 = FT.[Key]

--Now insert into @Results any items that has a match in TableB but not in TableA
--This query may/may not be desired based on your business rules.
INSERT INTO @Results
(SkillKeyId, Rank)
( SELECT TableB.b2, Sum(FT.Rank)
FROM TableB INNER JOIN FreeTextTable(TableB, *, 'search term') FT
ON TableB.b1 = FT.[key]
LEFT JOIN @Results RS
ON RS.a1 = TableB.b2
WHERE RS.a1 IS NULL
GROUP BY TableB.b2
)

--All that left is to return the results
SELECT TableA.*, RS.Rank AS Total_Rank
FROM TableA INNER JOIN @Results RS
ON TableA.a1 = RS.a1
ORDER BY RS.Rank DESC

, , .

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