SQL Server : select * from table where date minus one year - sql

Question

How to select year-1?
This is my code:
select
a.*
from
(select
met_men, kli_kod, pre_kod, galutinis, savik_group, marza,
KLR_KOD, KLI_POZ1, KLI_POZ2, KLI_POZ3, KLG_KOD, PRE_RUS,
PRE_POZ1, PRE_POZ2, PRE_POZ3, PRE_POZ4, PRE_POZ5, PRE_POZ6,
did_dat, savi_suproc, marza_suproc, pre_ska dbo.SVF_View_10) AS a
left outer join
(select
pre_kod, kli_kod, met_men, did_dat
from
dbo.SVF_View_10_sum
where
dateadd(year, -1, 'did_dat')) as b on a.kli_kod = b.kli_kod
and a.pre_kod = b.pre_kod
and a.did_dat = b.did_dat
This error occurs on the line where DATEADD(year, -1, 'did_dat')) as b:
Msg 4145, Level 15, State 1, Line 6
An expression of non-boolean type specified in a context where a condition is expected, near ')'.
Please help me
the required data: order date, id, quantity, orderdate-1 year, quantity. It is necessary to compare the quantity sold for this year and for the last year

Answer 1

You give column name in single quote dateadd(year, -1, 'did_dat') which is no need here change into dateadd(year, -1, did_dat) and when you use where clause need to give comparison operation in where clause.
so changed into
where did_dat <= dateadd(year, -1, did_dat)
but it doesn't make any sense because query should be execute on previous year against current date like
where did_dat <= dateadd(year, -1, GETDATE())

Answer 2

I suspect what you want is:
select . . .
from dbo.SVF_View_10 v left outer join
dbo.SVF_View_10_sum vs
on v.kli_kod = vs.kli_kod and a.pre_kod = b.pre_kod and
v.did_dat = dateadd(year, -1, vs.did_dat);
Notes:
Subqueries are not necessary for this query. I think they just make the query harder to write and to read.
Use table aliases that are abbreviations for the table names.
You have a date calculation in the where clause rather than a boolean expression. That is causing your error.
The date expression has a string for the third argument. The would be your next error. Strings do not refer to column names.
I am speculating that you want the tables joined on that date expression.

Answer 3

Try This :-
SELECT a.*
FROM
(
SELECT met_men,kli_kod,pre_kod,galutinis,savik_group,marza,KLR_KOD,LI_POZ1,
KLI_POZ2,KLI_POZ3,KLG_KOD,PRE_RUS,PRE_POZ1,PRE_POZ2,PRE_POZ3,PRE_POZ4,
PRE_POZ5,PRE_POZ6,did_dat,savi_suproc,marza_suproc,pre_ska
FROM SVF_View_10_sum
) AS a
LEFT OUTER JOIN
(
SELECT pre_kod,kli_kod,met_men,did_dat
FROM dbo.SVF_View_10_sum
WHERE did_dat = DATEADD(YEAR, -1, did_dat)
) AS b
ON a.kli_kod = b.kli_kod AND a.pre_kod = b.pre_kod AND a.did_dat = b.did_dat;