Final answer:
The 'Column ambiguously defined' error in SQL is resolved by prefixing the ambiguous column with the table name or alias to which it belongs, avoiding confusion when the same column name exists in multiple tables.
Step-by-step explanation:
The error 'Column ambiguously defined' in SQL occurs when a query references a column name that is present in more than one table or subquery in the FROM clause without sufficient context to allow the database to determine which table you mean. To resolve this issue, you should prefix the ambiguous column with the table name or alias that it belongs to. For example, if you have two tables, Customer and Order, and both tables have a column named id, you must specify the table when you reference the id column in your SELECT statement, like Customer.id or Order.id. Here's an example:
SELECT Customer.id, Order.date FROM Customer JOIN Order ON Customer.id = Order.customer_id;For example, if you have two tables, 'table1' and 'table2', both having a column named 'column1', and you want to use 'column1' from 'table2' in your query, you can write it as 'table2.column1'.This specifies that you are selecting the id column from the Customer table and the date column from the Order table, thus resolving any ambiguity. If the query involves aliases for tables, use the alias in the same way to clarify the column references:SELECT c.id, o.date FROM Customer AS c JOIN Order AS o ON c.id = o.customer_id;