SQL跟踪器的MDW脚本出错

Question

SQL Server MDW附带了内置报告，我对报告背后的底层代码感到好奇，以自定义报告。我使用sql tracer来查看发生了什么，这是包含错误的输出。想知道是否有人能看到什么问题？

我收到以下错误：

  

Msg 4145，Level 15，State 1，Line 26非布尔类型的表达式   在预期条件的上下文中指定，在';'附近。

DECLARE @ServerName varchar(max)
DECLARE @SelectedDatabaseName varchar(max)
DECLARE @snapshot_id int

SELECT TOP 1 @snapshot_id = snapshot_id FROM (

SELECT DISTINCT TOP 100 d.snapshot_id
FROM snapshots.disk_usage d, core.snapshots ss
WHERE ss.instance_name = @ServerName
AND ss.snapshot_id = d.snapshot_id
ORDER BY d.snapshot_id DESC
) AS q
ORDER BY snapshot_id ASC

SELECT
database_name,
CONVERT (datetime, SWITCHOFFSET (CAST (d.collection_time AS datetimeoffset), '+00:00')) AS collection_time,
d.snapshot_id,
((convert(dec (15,2),d.dbsize) + convert(dec(15,2),d.logsize)) * 8192 / 1048576.0) AS 'database_size_mb',
'reserved_mb' = (d.reservedpages * 8192 / 1048576.0),
'data_mb' = convert(dec(15,2),d.pages) * 8192 / 1048576.0,
'index_mb'= (d.usedpages - d.pages) * 8192 / 1048576.0,
'unused_mb' = ((convert(dec (15,2),d.reservedpages) - convert(dec(15,2),d.usedpages)) * 8192 / 1048576.0),
'unallocated_space_mb' = (
case
when d.dbsize >= d.reservedpages
then (convert (dec (15,2),d.dbsize) - convert (dec (15,2),d.reservedpages)) * 8192 / 1048576.0
else 0
end)

FROM snapshots.disk_usage d, core.snapshots ss

WHERE database_name =@SelectedDatabaseName

AND d.snapshot_id >= @snapshot_id
AND ss.instance_name = @ServerName
AND d.snapshot_id = ss.snapshot_id
ORDER BY collection_time asc