Interview Question Quality Assurance Engineers
Country: India
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Column names are only guaranteed to be unique within the context of a particular database, schema, and table, so the operation you're asking for is not well-defined.
- eugene.yarovoi June 08, 2014If you happen to know for a fact that the column you want has a name that is unique throughout all the databases, schemas, and tables on a particular machine, you should be able to run a query on the system metadata to determine the name of the database and table containing the column. For example, in T-SQL you could try running the following query on each database where the column could be located:
select s.name + '.' + t.Name,
from sys.columns c
join sys.tables t
on t.object_id = c.object_id
and c.name = @VariableHoldingYourColumnName
join sys.schemas s
on t.schema_id = s.schema_id
This should give you the full name of the table containing the column. You can then dynamically build a query that queries this table.
If you don't even know the database name, you'd have to use a temp table to hold the results while using a cursor to iterate over the databases.