SQL query help - find table in unknown schema and query data - sql

Question

I have a couple of simple queries I run manually in Oracle as sysdba to check the version info for a java application. The tricky part is that the schema names vary, so sometimes I have to search for the table to find the owner/schema and then query the info.
Is there a way to take the output from one query and use it to perform a schema-qualified query, so it can be automated?
The queries I use are:
SELECT username FROM dba_tables WHERE table_name LIKE 'APPVERSDATA%';
SELECT max(appfullversion) from SCHEMA.APPVERSDATA;
There must be a way to pass the name of the schema from the first query as a variable to the second query?
Edit: Ultimately I would like to set the output as a variable in shell script.
TIA

Answer 1

I assume that SCHEMA.APPVERSDATA would be the output of the first query so the best thing to do might be execute some PL/SQL as a store function or procedure:
DECLARE
l_schema varchar2(10);
BEGIN
SELECT DISTINCT owner
INTO l_schema
FROM dba_tables
WHERE table_name LIKE 'APPVERSDATA%';
EXECUTE IMMEDIATE 'SELECT max(appfullversion) from ' || l_schema || '.APPVERSDATA';
end;
/
This doesn't address what you are going to do with the data once it executes though. Update the question and I'll update the answer.
Edit(Version 2!):
So your shell would look something like this:
x () {
sqlplus -s u/p<<EOF
set serveroutput on;
set feedback off;
DECLARE
l_schema varchar2(10);
BEGIN
SELECT DISTINCT owner
INTO l_schema
FROM dba_tables
WHERE table_name LIKE 'APPVERSDATA%';
EXECUTE IMMEDIATE 'SELECT max(appfullversion) from ' || l_schema || '.APPVERSDATA';
dbms_output.put_line(l_return);
end;
/
EOF
}
echo $(x $1)