CODEWITHSUNDEEP
sqlsql-serversql-server-2008
Egor
Egor

Reputation: 119

Update table variable

I have a table variable @searchResult:

DECLARE @searchResult TABLE (
    [name_template] NVARCHAR(50),
    [record_id] INT,
    [record_name] NVARCHAR(50)
);

And table [records]:

CREATE TABLE [records] (
    [record_id] INT IDENTITY(1, 1) PRIMARY KEY,
    [record_name] NVARCHAR(50)
)

@searchResult contains records with [name_template] filled only. I want to update it with latest [record_id] and [record_name] from [records] table that match [name_template].

I've tried folowing SQL query with no success:

UPDATE @searchResult
SET [record_id] = r.[record_id], [record_name] = r.[record_name]
FROM (
    SELECT TOP 1
          r.[record_id]
        , r.[record_name]
    FROM [records] AS r
    WHERE r.[record_name] LIKE [name_template]
    ORDER BY r.[record_id] DESC
) AS r;

Error message:

Invalid column name 'name_template'.

What is correct syntax to update @searchResult with desired values?

Upvotes: 6

Views: 28854

Answers (3)

K Scandrett
K Scandrett

Reputation: 16540

The most straightforward approach is to rename the column in the table variable to something unique, then the ambiguity disappears:

DECLARE @searchResult TABLE (
    [name_template] NVARCHAR(50),
    [record_id_1] INT,
    [record_name_1] NVARCHAR(50)
);

Upvotes: 0

Pradeep Kumar
Pradeep Kumar

Reputation: 6979

You need to do a CROSS APPLY on the tables.

UPDATE @searchResult
SET [record_id] = r.[record_id], 
    [record_name] = r.[record_name]
FROM @searchResult SR
CROSS APPLY (
    SELECT TOP 1 *
    FROM [records]
    WHERE [record_name] LIKE [name_template]   -- Your wish, but do you really need LIKE matching??
    ORDER BY [record_id] DESC
) AS r;

Upvotes: 8

Zohar Peled
Zohar Peled

Reputation: 82514

Try this:

UPDATE t
SET [record_id] = r.[record_id], 
    [record_name] = r.[record_name]
FROM @searchResult t
INNER JOIN 
(
    SELECT MAX([record_id]) As [record_id]
            ,[record_name]
    FROM [records]
    GROUP BY [record_name] 
) r
ON r.[record_name] LIKE t.[name_template];

Update:
Seems to be working fine from what I've tested:

Create table and table variable:

CREATE TABLE [records] (
    [record_id] INT IDENTITY(1, 1) PRIMARY KEY,
    [record_name] NVARCHAR(50)
)

DECLARE @searchResult TABLE (
    [name_template] NVARCHAR(50),
    [record_id] INT,
    [record_name] NVARCHAR(50)
);

Populate with sample data:

INSERT INTO [records] ([record_name]) VALUES('a'), ('a'), ('a'), ('b'), ('b')

INSERT INTO @searchResult ([name_template]) VALUES ('a'), ('b')

Update table variable:

UPDATE t
SET [record_id] = r.[record_id], 
    [record_name] = r.[record_name]
FROM @searchResult t
INNER JOIN 
(
    SELECT MAX([record_id]) As [record_id]
            ,[record_name]
    FROM [records]
    GROUP BY [record_name] 
) r
ON r.[record_name] LIKE t.[name_template];

Check results:

SELECT *
FROM records

SELECT *
FROM @searchResult

DROP TABLE records

Results:

records
record_id   record_name
----------- -----------
1           a
2           a
3           a
4           b
5           b

@searchResult
name_template   record_id   record_name
-------------   ---------   -----------
a               3           a
b               5           b

Upvotes: 4

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