COUNT without GROUP BY clause issue - sql-server

Question

I'm probably missing something simple here. I have this first table:
CREATE TABLE [Orgnzs] (
[id] INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
[nm] NVARCHAR(256)
);
and then also several tables that are all created as such (all having the same structure):
-- WLog_* tables are all created as such
CREATE TABLE [WLog_1] (
[id] BIGINT NOT NULL IDENTITY(1,1) PRIMARY KEY,
[huid] UNIQUEIDENTIFIER,
[dtin] BIGINT,
[dtout] BIGINT,
[cnm] NVARCHAR(15),
[batt] TINYINT,
[pwrop] TINYINT,
[pst] INT,
[flgs] INT,
[ppocs] NVARCHAR(1024),
[ppocu] NVARCHAR(1024),
[por] NVARCHAR(1024)
);
and a similar set of tables, without last 3 columns of the table above:
-- ULog_* tables are all created as such
CREATE TABLE [ULog_1] (
[id] BIGINT NOT NULL IDENTITY(1,1) PRIMARY KEY,
[huid] UNIQUEIDENTIFIER,
[dtin] BIGINT,
[dtout] BIGINT,
[cnm] NVARCHAR(15),
[batt] TINYINT,
[pwrop] TINYINT,
[pst] INT,
[flgs] INT
);
My goal is to select records from arbitrary set of WLog_* and ULog_* tables, and limit it by manageable number of elements (for page layout) for which I also need to know the total count of records found.
So I do selection as such:
SELECT b.[id] AS evtID,
b.[huid] as huid,
b.[dtin] as dtin,
b.[dtout] as dtout,
b.[cnm] as cnm,
b.[batt] as batt,
b.[pwrop] as pwrop,
b.[pst] as pst,
b.[flgs] as flgs,
b.[ppocs] as ppocs,
b.[ppocu] as ppocu,
b.[por] as por,
b.[orgID] as orgID,
b.[wLg] as wLg,
orgz.[nm] as orgNm
, COUNT_BIG(*) as allRecordsFound
FROM (
-- next also specify the column(s) to sort by
SELECT *, ROW_NUMBER() OVER (ORDER BY [dtin], [cnm] ASC) AS rw FROM (
SELECT *, 1 AS orgID, 1 AS wLg
FROM [WLog_1]
UNION ALL
SELECT *, 2 AS orgID, 1 AS wLg
FROM [WLog_2]
UNION ALL
SELECT *, NULL AS [ppocs], NULL AS [ppocu], NULL AS [por], 1 AS orgID, 0 AS wLg
FROM [ULog_1]
) a
WHERE [pst]&1=1 OR [pst]=67
) b
LEFT JOIN [Orgnzs] AS orgz ON orgID=orgz.[id]
WHERE rw >= 2 AND rw <= 4 -- restrict for a page only
which unfortunately fails on the COUNT_BIG(*) as allRecordsFound line with the following error:
Column 'b.id' is invalid in the select list because it is not
contained in either an aggregate function or the GROUP BY clause.
I haven't used SQL Server for a while, can someone suggest what am I missing here?
PS. For a test purpose I made a Fiddle to try it out.

Answer 1

Use this instead:
count(*) over() as allRecordsFound
You can mix window aggregation function in select statement whithout grouping.