One way to do it if tagID
values are known upfront is to use conditional aggregation
SELECT TimeSeconds,
COALESCE(MAX(CASE WHEN TagID = 'A1' THEN Value END), 'n/a') A1,
COALESCE(MAX(CASE WHEN TagID = 'A2' THEN Value END), 'n/a') A2,
COALESCE(MAX(CASE WHEN TagID = 'A3' THEN Value END), 'n/a') A3,
COALESCE(MAX(CASE WHEN TagID = 'A4' THEN Value END), 'n/a') A4
FROM table1
GROUP BY TimeSeconds
or if you're OK with NULL
values instead of 'n/a'
SELECT TimeSeconds,
MAX(CASE WHEN TagID = 'A1' THEN Value END) A1,
MAX(CASE WHEN TagID = 'A2' THEN Value END) A2,
MAX(CASE WHEN TagID = 'A3' THEN Value END) A3,
MAX(CASE WHEN TagID = 'A4' THEN Value END) A4
FROM table1
GROUP BY TimeSeconds
or with PIVOT
SELECT TimeSeconds, A1, A2, A3, A4
FROM
(
SELECT TimeSeconds, TagID, Value
FROM table1
) s
PIVOT
(
MAX(Value) FOR TagID IN (A1, A2, A3, A4)
) p
Output (with NULL
s):
TimeSeconds A1 A2 A3 A4
----------- ------- ------ ----- -----
1378700244 3.75 NULL NULL NULL
1378700245 30.00 NULL NULL NULL
1378700304 1.20 NULL NULL NULL
1378700305 NULL 56.00 NULL NULL
1378700344 NULL 11.00 NULL NULL
1378700345 NULL NULL 0.53 NULL
1378700364 4.00 NULL NULL NULL
1378700365 14.50 NULL NULL NULL
1378700384 144.00 NULL NULL 10.00
If you have to figure TagID
values out dynamically then use dynamic SQL
DECLARE @cols NVARCHAR(MAX), @sql NVARCHAR(MAX)
SET @cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(TagID)
FROM Table1
ORDER BY 1
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)'),1,1,'')
SET @sql = 'SELECT TimeSeconds, ' + @cols + '
FROM
(
SELECT TimeSeconds, TagID, Value
FROM table1
) s
PIVOT
(
MAX(Value) FOR TagID IN (' + @cols + ')
) p'
EXECUTE(@sql)