SQL How to return only a number of columns, say the first 10 without specifying them in the SQL query

Question

I've got an oracle database and a table that has a lot of columns and rows.. I want to return onl the first 10 columns to my JTables but I don't want to name each column in my query.

Is it possible?

edit: isnt there a column index? or something like rownum but for columns?

Answer 1

不会，但是即使这样，您也可能想将它们写出来，因为顺序可能会更改。

Answer 2

I don't want to name each column in my query.

You can programatically fetch column name and can generate query on fly and then can obtain your goal

Answer 3

SQL deals with sets and properties of sets by definition have no order. http://en.wikipedia.org/wiki/File:Relational_model_concepts.png see Attribute (column) unordered. Literally what you are asking for has no meaning.

Answer 4

There are ways of doing what you want, but you shouldn't because that ties your implementation to a physical table layout. This is a bad thing.

See How do I exclude columns... and Select vs select column..

If, after reading those questions you still want to do this, you can have a look at USER_TAB_COLUMNS . The column COLUMN_ID will contain the sequence number of the column as created. You could then select COLUMN_NAME where COLUMN_ID <= 10 , and find a way of constructing a query with those columns.