How to find List Tables using columns value - sql

Question

I have 500+ tables in database. All tables have several columns. Among them Some tables have 'CMDFLAG' column and value of the columns may have 'C'or'D' or 'M'.
My requirement is to find the list of tables where CMDFLAG is 'C'or'D' or 'M'.
Table Name Column Name Value
---------- ----------- -----
Table_A CMDFLAG C
Table_A CMDFLAG D
Table_A CMDFLAG M
Table_B CMDFLAG C
Table_B CMDFLAG D
Table_C CMDFLAG M
so on ...
I can find list of tables these have CMDFLAG column using INFORMATION_SCHEMA.COLUMNS. But I Want to find list of tables where CMDFLAG columns have value 'C'or'D' or 'M'.
I have gone through several questions but can't fulfill my requirement. Moreover I want to use simple query not procedure.

Answer 1

Try this. I have to use dynamic query and temp tables as EXEC does not work for common table expressions.
CREATE TABLE #t1
(
tableName varchar(30),
RN INT
)
CREATE TABLE #t2
(
tableName varchar(30),
columnName varchar(30),
value char(1)
)
INSERT INTO #t1
SELECT C.TABLE_NAME, ROW_NUMBER() OVER(ORDER BY TABLE_NAME) AS RN
FROM INFORMATION_SCHEMA.COLUMNS C
WHERE C.COLUMN_NAME = 'CMDFLAG'
DECLARE #COUNT AS INT = (SELECT COUNT(1) FROM #t1)
DECLARE #Iterator AS INT = 1
DECLARE #tableName AS VARCHAR(30)
DECLARE #script AS VARCHAR(200)
WHILE #Iterator <= #COUNT
BEGIN
SELECT #tableName = (SELECT tableName FROM #t1 WHERE RN = #Iterator)
SELECT #script = 'SELECT '''+#tableName+''', ''CMDFLAG'', CMDFLAG FROM '+#tableName+' GROUP BY CMDFLAG'
INSERT INTO #t2
EXEC(#script)
SELECT #Iterator = #Iterator + 1
END
SELECT * FROM #t2
DROP TABLE #t1
DROP TABLE #t2

Answer 2

You can do it as follows.
SET NOCOUNT ON;
DECLARE #colname SYSNAME='CMDFLAG';
CREATE TABLE #tablenames(tablename SYSNAME,colname SYSNAME,colval NVARCHAR(128));
DECLARE #dsql NVARCHAR(MAX)= (
SELECT
N'INSERT INTO #tablenames(tablename,colname,colval)'+
N'SELECT DISTINCT ' +
'tablename='''+REPLACE(t.TABLE_NAME,N'''',N'''''')+N''','+
'colname='''+REPLACE(#colname,N'''',N'''''')+N''','+
'colval='+QUOTENAME(#colname)+N' '+
N'FROM '+QUOTENAME(t.TABLE_SCHEMA)+N'.'+QUOTENAME(t.TABLE_NAME)+N' '+
N'WHERE '+QUOTENAME(#colname)+N' IN (''C'',''D'',''M'');'
FROM
INFORMATION_SCHEMA.TABLES AS t
INNER JOIN INFORMATION_SCHEMA.COLUMNS AS c ON
c.TABLE_SCHEMA=t.TABLE_SCHEMA AND
c.TABLE_NAME=t.TABLE_NAME
WHERE
t.TABLE_TYPE='BASE TABLE' AND
c.COLUMN_NAME=#colname
FOR
XML PATH('')
);
EXECUTE sp_executesql #dsql;
SELECT * FROM #tablenames ORDER BY tablename;
DROP TABLE #tablenames;

Answer 3

How about something like this:
DECLARE #ColumnName sysname = 'CMDFLAG', #Sql NVARCHAR(MAX)
IF OBJECT_ID(N'TempDB.dbo.#Results', N'U') IS NULL
CREATE TABLE #Results(TableName SYSNAME, RowCounts INT)
ELSE
TRUNCATE TABLE #Results
SELECT
#Sql = 'INSERT INTO #Results '
+ STUFF((
SELECT
'UNION ALL SELECT Table_Name = '
+ QUOTENAME(C.TABLE_SCHEMA + '.' + C.TABLE_NAME, '''')
+ ', NumRows = COUNT(*)'
+ ' FROM '
+ QUOTENAME(C.TABLE_SCHEMA) + '.'
+ QUOTENAME(C.TABLE_NAME )
+ ' WHERE ' + QUOTENAME(C.COLUMN_NAME) + ' IN(''C'', ''D'', ''M'') '
+ ' GROUP BY ' + QUOTENAME(C.COLUMN_NAME)
+ ' HAVING COUNT(*) > 0 '
FROM
INFORMATION_SCHEMA.COLUMNS C
CROSS APPLY
(
SELECT
T.TABLE_SCHEMA, T.TABLE_NAME
FROM
INFORMATION_SCHEMA.TABLES T
WHERE
T.TABLE_TYPE = 'BASE TABLE'
AND T.TABLE_SCHEMA = C.TABLE_SCHEMA
AND T.TABLE_NAME = C.TABLE_NAME
) T
WHERE
C.COLUMN_NAME = #ColumnName
FOR XML PATH(''), type).value('.', 'nvarchar(max)'), 1, 10, '')
EXEC(#Sql)
SELECT * FROM #Results
UPDATE
Ok this should do what you want:
DECLARE #ColumnName sysname = 'CMDFLAG', #Sql NVARCHAR(MAX)
IF OBJECT_ID(N'TempDB.dbo.#Results', N'U') IS NULL
CREATE TABLE #Results(TableName SYSNAME, ColumnName sysname, Value NVARCHAR(25))
ELSE
TRUNCATE TABLE #Results
SELECT
#Sql = 'INSERT INTO #Results '
+ STUFF((
SELECT
'UNION ALL SELECT DISTINCT Table_Name = '
+ QUOTENAME(C.TABLE_SCHEMA + '.' + C.TABLE_NAME, '''')
+ ', ' + QUOTENAME(C.COLUMN_NAME, '''')
+ ', ' + QUOTENAME(C.COLUMN_NAME)
+ ' FROM '
+ C.TABLE_SCHEMA + '.'
+ C.TABLE_NAME
+ ' WHERE ' + QUOTENAME(C.COLUMN_NAME) + ' IN(''C'', ''D'', ''M'') '
FROM
INFORMATION_SCHEMA.COLUMNS C
CROSS APPLY
(
SELECT
T.TABLE_SCHEMA, T.TABLE_NAME
FROM
INFORMATION_SCHEMA.TABLES T
WHERE
T.TABLE_TYPE = 'BASE TABLE'
AND T.TABLE_SCHEMA = C.TABLE_SCHEMA
AND T.TABLE_NAME = C.TABLE_NAME
) T
WHERE
C.COLUMN_NAME = #ColumnName
FOR XML PATH(''), type).value('.', 'nvarchar(max)'), 1, 10, '')
EXEC(#Sql)
SELECT * FROM #Results