Select every row from every table in database where (columnName = value) if column name exists
I'm using SQL Server 2005 and am logged in as sa
. I would like to query every table in my database for whether it has a certain column name. And if so append every row where (columnNameValue = someValue) to a results table. Then return said results table.
There are a few similar problems with solutions out there. Notably I can use sp_MSForeachTable
for this but it lacks any kind of documentation. I can use SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
to get a list of all the tables.
The following solution (link text) will go every table & every column to find a certain value in the cell. Which is different from finding a certain value in the cell IF that column is a certain columnName.
Writing a nested while statement should be possible but are there any inbuilt commands to run queries like this?
Pseudo-Code if it helps :
foreach(table in tableList) {
if (table.hasColumnName(SOME_COLUMN) {
EXEC ('SELECT * FROM table WHERE (SOME_COLUMN = SOME_VALUE)')
}
}
[Edit]
Rather then having a single results set I would like to be a single result per table as long as the select returns at least one row. This should give a very large amount of different results as expecting a join or union to work is unrealistic.
If possible I would like to append the tablename to start of each result.
I have a simple query below that gets all the results but It will display empty tables and doesnt give any visual indication in individual results as to what table it belongs to:
[Further Edit]
Updated the query below to include the IF EXIST check that removes NULL results & the select name AS source column to add the table source to the results thanks to @Martin
DECLARE @COLUMN_VALUE nvarchar(512), @VALUE nvarchar(10);
SET @COLUMN_VALUE = 'id'
SET @VALUE = '0';
DECLARE @TABLE_NAME nvarchar(512), @COLUMN_NAME nvarchar(512), @QUERY nvarchar(512);
SET @TABLE_NAME = '';
WHILE @TABLE_NAME IS NOT NULL
BEGIN
SET @TABLE_NAME =
(
SELECT MIN(QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME))
FROM INFORMATION_SCHEMA.TABLES
WHERE QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) > @TABLE_NAME
);
PRINT 'Table name : ' + @TABLE_NAME;
SET @COLUMN_NAME =
(
SELECT MIN(QUOTENAME(COLUMN_NAME))
FROM INFORMATION_SCHEMA.COLUMNS
WHERE (TABLE_NAME = PARSENAME(@TABLE_NAME, 1))
AND (COLUMN_NAME = @COLUMN_VALUE)
);
PRINT 'Column name : ' + @COLUMN_NAME;
IF @COLUMN_NAME IS NOT NULL
BEGIN
SET @QUERY =
'SELECT ''' + @TABLE_NAME + ''' AS Source, * ' +
'FROM ' + @TABLE_NAME + ' ' +
'WHERE (' + @COLUMN_NAME 开发者_开发知识库+ ' = ' + @VALUE + ')'
EXEC
(
'IF EXISTS(' + @QUERY + ') ' + @QUERY
)
END
END
CREATE TABLE foo
(
SOME_COLUMN VARCHAR(10)
)
CREATE TABLE bar
(
SOME_COLUMN VARCHAR(10)
)
INSERT INTO bar VALUES ('SOME_VALUE')
DECLARE @Query nvarchar(max)
SELECT
@Query = isnull(@Query + ';','') +
'IF EXISTS(SELECT * FROM ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' +
QUOTENAME(o.name) + ' WHERE SOME_COLUMN=''SOME_VALUE'')
SELECT ''' + o.name +''' AS Source, * FROM ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' +
QUOTENAME(o.name) + ' WHERE SOME_COLUMN=''SOME_VALUE'''
FROM sys.columns c
JOIN sys.objects o
ON o.object_id = c.object_id
WHERE o.type IN ('U','V') AND c.name = 'SOME_COLUMN'
EXEC sp_executesql @Query
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