T-SQL row count for each table with a WHERE - sql

Question

I'm using SQL Server and have the below query to retrieve the RowCount of all tables that begin with 'IN%'. This works fine.
However, within each 'IN...' table there is a column called 'ErrorFlg' - this can be 0 or 1.
How do I modify the below to also include a new column called 'NoOfErrors' that will count where the 'ErrorFlg = 1' in each table?
SELECT
ta.name AS TableName,
SUM(pa.rows) AS RowCnt
FROM
sys.tables AS ta
INNER JOIN
sys.partitions AS pa ON pa.object_id = ta.object_id
INNER JOIN
sys.schemas AS sc ON ta.schema_id = sc.schema_id
WHERE
(ta.is_ms_shipped = 0) AND (pa.index_id IN (1, 0))
AND (ta.name LIKE 'IN_%')
GROUP BY
sc.name, ta.name
ORDER BY
TableName, RowCnt DESC
Ideal output:
TableName RowCnt NoOfErrors
--------------------------------
IN_123 100 50
IN_4566 500 2
IN_ABC 250 125

Answer 1

As per #Lamu's suggestion, The will create a table variable with your results and then create and execute dynamic statements...
Declare #Tbl Table
(
TableName VarChar(50),
RowCnt Int
)
Insert Into #Tbl
SELECT
ta.name AS TableName,
SUM(pa.rows) AS RowCnt
FROM
sys.tables AS ta
INNER JOIN
sys.partitions AS pa ON pa.object_id = ta.object_id
INNER JOIN
sys.schemas AS sc ON ta.schema_id = sc.schema_id
WHERE
(ta.is_ms_shipped = 0) AND (pa.index_id IN (1, 0))
AND (ta.name LIKE 'IN_%')
GROUP BY
sc.name, ta.name
ORDER BY
TableName, RowCnt DESC
Declare #tblname VarChar(50)
Declare #rowcnt VarChar(10)
Declare #vsql VarChar(Max) = NULL
Declare c Cursor For Select TableName,RowCnt From #Tbl
Open c
Fetch Next From c Into #tblname, #rowcnt
WHILE ##FETCH_STATUS = 0
BEGIN
Set #vsql = 'Select ''' + #tblname +''' As Tbl,''' + #rowcnt + ''' As RowCnt, Count(*) As NoOfErrors From ' + #tblname + ' Where ErrorFlg = 1'
Exec(#vsql)
Set #vsql = NULL
Fetch Next From c Into #tblname, #rowcnt
END