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ASP FAQ Tutorials :: Databases :: Other Articles :: What does "ambiguous column name" mean?
What does "ambiguous column name" mean?
This usually means your SQL statement is joining on more than one table, and doesn't know which column you're trying to retrieve. For example:
To fix this, you'll want to butter up the statement a bit:
The changes:
| SELECT column1 FROM table1 JOIN table2 ON table1.column1 = table2.column1 |
To fix this, you'll want to butter up the statement a bit:
| SELECT column1 = t1.column1 FROM table1 t1 JOIN table2 t2 ON t1.column1 = t2.column1 |
The changes:
- Used an alias for the column name, so that external code continues to work when referencing "column1"
- Added the prefix "t1" to the requested column, so that the engine knows which table we want the data from
- Added table aliases in the FROM / JOIN clauses to shorten the code
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