Getting error with query statement sql server - sql

Question

When I execute the folowing query :
SELECT DISTINCT
dat.FiscalYear,
dat.MonthName As FiscalMonth,
dat.FiscalQuarter,
dat.FiscalSemester,
a.m AS m,
o.oName AS o,
o.Calculation,
o.oDispOrder ,
o.oGrpId
FROM
[V].[dbo].[DimDate] dat
CROSS JOIN
(SELECT
cal.calculation, ltrim(p.oName) As oName,
p.DisplayingOrder as oDispOrder, p.oGrpId
FROM
[V].[dbo].[Reporto] p
CROSS JOIN
(SELECT 'Year to Date' as Calculation
UNION
SELECT 'Current Dim Date' as Calculation
UNION
SELECT 'Previous Year' as Calculation
UNION
SELECT 'Last Year Current Month' as Calculation) cal
CROSS JOIN
(SELECT
ltrim(b.m) As m, b.DisplayingOrder as mDispOrder,
b.Used as used
FROM
[V].[dbo].[ReportBusinessLine] b
WHERE b.used = 1) a
WHERE
(p.used = 1 and p.reportId = 1)) o
WHERE
dat.FiscalYear = 2013
I always got the following error :
Msg 4104, Level 16, State 1, Line 6
The multi-part identifier "a.m" could not be bound.
Many thanks .

Answer 1

Formatted more clearly, your from statement is:
FROM [V].[dbo].[DimDate] dat CROSS JOIN
(SELECT cal.calculation, ltrim(p.oName) As oName, p.DisplayingOrder as oDispOrder, p.oGrpId
FROM [V].[dbo].[Reporto] p CROSS JOIN
(SELECT 'Year to Date' as Calculation UNION
SELECT 'Current Dim Date' as Calculation UNION
SELECT 'Previous Year' as Calculation UNION
SELECT 'Last Year Current Month' as Calculation
) cal CROSS JOIN
(SELECT ltrim(b.m) As m, b.DisplayingOrder as mDispOrder, b.Used as used
FROM [V].[dbo].[ReportBusinessLine] b
WHERE b.used = 1
) a
WHERE (p.used = 1 and p.reportId =1 )
) o
WHERE dat.FiscalYear = 2013
You can clearly see that a is a table alias in a subquery. If you want the field m, then you need to put it at the level of o:
FROM [V].[dbo].[DimDate] dat CROSS JOIN
(SELECT cal.calculation, ltrim(p.oName) As oName, p.DisplayingOrder as oDispOrder, p.oGrpId,
a.m
FROM [V].[dbo].[Reporto] p CROSS JOIN
(SELECT 'Year to Date' as Calculation UNION
SELECT 'Current Dim Date' as Calculation UNION
SELECT 'Previous Year' as Calculation UNION
SELECT 'Last Year Current Month' as Calculation
) cal CROSS JOIN
(SELECT ltrim(b.m) As m, b.DisplayingOrder as mDispOrder, b.Used as used
FROM [V].[dbo].[ReportBusinessLine] b
WHERE b.used = 1
) a
WHERE (p.used = 1 and p.reportId =1 )
) o
WHERE dat.FiscalYear = 2013
And then refer to it as o.m in the select.
Formatting code so it is readable can do wonders for finding and preventing errors.

Answer 2

Try this one -
SELECT DISTINCT
dat.FiscalYear,
dat.monthname AS FiscalMonth,
dat.FiscalQuarter,
dat.FiscalSemester,
o.m AS m, --<--- invalid alias
o.oName AS o,
o.Calculation,
o.oDispOrder,
o.oGrpId
FROM [dbo].[DimDate] dat
CROSS JOIN (
SELECT
cal.calculation,
LTRIM(p.oName) AS oName,
p.DisplayingOrder AS oDispOrder,
p.oGrpId,
a.m --<--- missing in SELECT
FROM [dbo].[Reporto] p
CROSS JOIN (
SELECT 'Year to Date' AS Calculation
UNION ALL
SELECT 'Current Dim Date'
UNION ALL
SELECT 'Previous Year'
UNION ALL
SELECT 'Last Year Current Month'
) cal
CROSS JOIN (
SELECT
LTRIM(b.m) AS m,
b.DisplayingOrder AS mDispOrder,
b.Used AS used
FROM [dbo].[ReportBusinessLine] b
WHERE b.used = 1
) a
WHERE p.used = 1 AND p.reportId = 1
) o
WHERE dat.FiscalYear = 2013