nguyen wrote:

when i excecuted sql command "select * from employee" then result were ok,
but if sql command were "select employeeID from employee" then have error
return : column employeeID does not exist

This error is usually produced because a column of that name does not exist.

Since you are using a mixed-case column-name, I'm guessing that's the cause of the problem. If you create a column mixed-case by quoting it:

CREATE TABLE employee (
  "employeeID" int4
  ...
)

Then you need to quote it when you use it:

SELECT "employeeID" FROM employee;

If you don't quote when you create, then the column is case-insensitive.

See the mailing-list archives for plenty of details.

--
  Richard Huxton
  Archonet Ltd

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