When joining tables,it is always necessary to qualify a column name.

Name: When joining tables,it is always necessary to qualify a column name.
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It is not always necessary to qualify a column name when joining tables. If two tables have columns with identical names, you'll want to qualify the column names to avoid ambiguity. However, if the two tables have unique column names, you can omit the table name when referencing the column in your join statement.

When Joining Tables,it Is Always Necessary to Qualify a Column