Run a query in every table that contains a specific column - sql-server

Question

I run this query to get all the tables that include a specific column name
SELECT COLUMN_NAME, TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME LIKE '%myColumn%'
Then, for every single table, I want to run a query like this one:
SELECT * FROM table WHERE myColumn = xxx
Is there any way to do it automatically and run the second query to all the tables from the first query?
I have a fairly big database and I want to check if there is anywhere stored something about the specific Id on myColumn. And this column is used in about 200 tables.

Answer 1

I guess you need to use dynamic query for this. in this I saved the Schema result in a table variable and then loop through them to generate the required query. please try the below:
DECLARE #Template varchar(max)='SELECT * FROM [TABLE_NAME] WHERE [COLUMN_NAME] = ''xxx''';
DECLARE #CMD varchar(max);
DECLARE #id int=1, #TABLE_NAME varchar(255), #COLUMN_NAME varchar(255)
declare #Table table(id int identity(1,1), COLUMN_NAME varchar(255), TABLE_NAME varchar(255))
INSERT INTO #Table (TABLE_NAME, COLUMN_NAME)
SELECT TABLE_NAME, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME LIKE '%Label%'
SELECT #id=ID, #TABLE_NAME = TABLE_NAME, #COLUMN_NAME = COLUMN_NAME FROM #Table WHERE ID = #id
While ##ROWCOUNT>0 BEGIN
SET #CMD = REPLACE(#Template, '[TABLE_NAME]', #TABLE_NAME)
SET #CMD = REPLACE(#CMD, '[COLUMN_NAME]', #COLUMN_NAME)
Print #cmd
EXEC (#CMD)
SELECT #id=ID, #TABLE_NAME = TABLE_NAME, #COLUMN_NAME = COLUMN_NAME FROM #Table WHERE ID = #id + 1
End

Answer 2

You could do this as follows. The script builds all the SELECT statements in a VARCHAR and then executes dynamically. Works when you for integers as well as varchars.
DECLARE #col_name SYSNAME='myColumn';
DECLARE #expected_value NVARCHAR(256)='xxx';
DECLARE #sel_stmts NVARCHAR(MAX) = (
SELECT
';SELECT '+
'* '+
'FROM '+
QUOTENAME(t.TABLE_SCHEMA)+'.'+QUOTENAME(t.TABLE_NAME) +
'WHERE '+
QUOTENAME(c.COLUMN_NAME)+'='''+REPLACE(#expected_value,'''','''''')+''''
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 LIKE '%'+#col_name+'%'
FOR
XML PATH('')
)+';';
--SELECT #sel_stmts; -- review
EXEC sp_executesql #sel_stmts; -- execute it

Answer 3

I made a couple changes to Ahmed Saeed's answer that were helpful for me so posting them here
Adding the schema name for dbs with more than one schema
Adding extra [] around the schema/db names in case one of those names is also a keyword
Printing the tablename with the results
DECLARE #Template varchar(max)='SELECT ''[TABLE_NAME]'' as TableName, * FROM [[DBSCHEMA_NAME]].[[TABLE_NAME]] WHERE [COLUMN_NAME] = ''xxx''';
DECLARE #CMD varchar(max);
DECLARE #id int=1, #DBSCHEMA_NAME varchar(255), #TABLE_NAME varchar(255), #COLUMN_NAME varchar(255)
declare #Table table(id int identity(1,1), COLUMN_NAME varchar(255), TABLE_NAME varchar(255), DBSCHEMA_NAME varchar(255))
INSERT INTO #Table (TABLE_NAME, COLUMN_NAME, DBSCHEMA_NAME)
SELECT TABLE_NAME, COLUMN_NAME, TABLE_SCHEMA
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME LIKE '%colname%'
SELECT #id=ID, #DBSCHEMA_NAME = DBSCHEMA_NAME, #TABLE_NAME = TABLE_NAME, #COLUMN_NAME = COLUMN_NAME FROM #Table WHERE ID = #id
While ##ROWCOUNT>0 BEGIN
SET #CMD = REPLACE(#Template, '[TABLE_NAME]', #TABLE_NAME)
SET #CMD = REPLACE(#CMD, '[COLUMN_NAME]', #COLUMN_NAME)
SET #CMD = REPLACE(#CMD, '[DBSCHEMA_NAME]', #DBSCHEMA_NAME)
Print #cmd
EXEC (#CMD)
SELECT #id=ID, #DBSCHEMA_NAME = DBSCHEMA_NAME, #TABLE_NAME = TABLE_NAME, #COLUMN_NAME = COLUMN_NAME FROM #Table WHERE ID = #id + 1
End