Column or global variable not found db2

I have a issue with DB2.

I have two libraries with the same structure database. The only one difference is the data.

When i try this sql request for the first library, it’s work

SELECT *
FROM Z24FR.CLIENT, Z24FR.EMPLOYE
WHERE CLIENT.CLINUM = EMPLOYE.CLINUM

but when i try with the other library, i have this error.

SELECT *
FROM Z24UK.CLIENT, Z24UK.EMPLOYE
WHERE CLIENT.CLINUM = EMPLOYE.CLINUM

Column or global variable CLINUM not found.
CLINUM was not found as a column of table *N in *N and was not found as a global variable in *N. If the table is *N, CLINUM is not a column of any table or view that can be referenced. 

I check the CLIENT and EMPLOYE tables and they have the column with data.

Thank you in advance for your answer

Answer

The way you qualify columns depends on the way tables are “declared”

see Table designators

So if you want something common you can code

SELECT *
FROM Z24xx.CLIENT CLIENT, Z24xx.EMPLOYE EMPLOYE
WHERE CLIENT.CLINUM = EMPLOYE.CLINUM

Or because comma notation is old and not really readable

SELECT
  *
FROM Z24xx.CLIENT CLIENT
  inner join Z24xx.EMPLOYE EMPLOYE on CLIENT.CLINUM = EMPLOYE.CLINUM