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How do I SELECT the same column from multiple tables?
you can use aliases in your query, so you will be able to get different column, e.g: select table1. productid as productId1, table1. price as price1, table2.
Can two tables have same column names?
Of course not. This is the absurdity of natural joins. In order to avoid this absurdity you would need to jam the table name into the column name as a prefix. However, if you have multiple schemas in your database, you can’t stop there.
How do I SELECT columns with the same name?
In a natural join, all the source table columns that have the same name are compared with each other for equality. With the column-name join, you select which same-name columns to compare. You can choose them all if you want, making the column-name join (effectively) a natural join.
Can SQL tables have multiple columns with the same name?
SQL is different. The namespace for a query can have multiple instances of the same column name. Usually, the SQL processor will generate an error message if there is an ambiguous reference to a column name.
How to select all columns with same name?
What I would like to obtain is a SELECT of all the cells with ‘N’ as value along with corresponding table name and id: Alternatively, you can change the example above to use a sub-query, which means you only need to change your predicate in one place:
How to work with multiple tables with same name?
I’m studying MS SQL, and mySQL and trying to practice using Joins (INNER and OUTER) etc…. I have some sample data and some column names are the same, so when referring to the column name in the query I need to reference to the full name path to the column.
How to view multiple tables containing the same column?
SELECT A.ID MasterID, A.Name MasterName, B.ID BandID, B.Name BandName, C.ID BlackadderID, C.Name BlackadderName D.ID BlackadderRealID, D.Name BlackadderRealName FROM TableA A INNER JOIN TableB B ON A.RelatedID = B.ID INNER JOIN TableC C ON B.RelatedID = C.ID INNER JOIN TableD D ON C.RelatedID = D.ID Use union. Here is explanation
How to Union two columns in a table?
You can if you union them (I would suggest including some indicator as to which table each record came from): select table1.column1, 1 as TableNumber from table1 union select table2.column1, 2 as TableNumber from table2 .. etc .. Rather than UNION, use UNION ALL, unless you specifically want duplicate rows to be excluded.