oracle: display results of dynamic sql based on antoher sql - sql

Question

I would like to display results of dynamic sql based on antoher sql, but get error message. My code:
DECLARE
sql_qry VARCHAR2(1000) := NULL;
TYPE results IS
TABLE OF all_tab_columns%rowtype;
results_tbl results;
BEGIN
FOR i IN (
SELECT
*
FROM
all_tab_columns
WHERE
owner = 'OWNER_XYZ'
AND upper(column_name) LIKE '%COLUMN_XYZ%'
ORDER BY
table_name,
column_name
) LOOP
sql_qry := ' SELECT DISTINCT '
|| i.column_name
|| ' as column_name '
|| ' FROM '
|| i.owner
|| '.'
|| i.table_name
|| ' WHERE SUBSTR('
|| i.column_name
|| ',1,1) = ''Y''';
EXECUTE IMMEDIATE sql_qry BULK COLLECT
INTO results_tbl;
dbms_output.put_line(results_tbl);
END LOOP;
END;
I get the error message:
PLS-00306: wrong number or types of arguments in call to 'PUT_LINE'
In fact I need the results of all queries with an union between them like that
[1] [1]: https://i.stack.imgur.com/llxzr.png

Answer 1

Your dynamic query is selecting a single column, but you are bulk collecting into results_tbl, which is of type results, based on all_tab_columns%rowtype - which has lots of columns.
If you define your collection type as a single column of the data type you need, i.e. some length of string:
DECLARE
sql_qry VARCHAR2(1000) := NULL;
TYPE results IS
TABLE OF varchar2(4000);
results_tbl results;
...
You will then bulk collect a single column into that single-column collection. To display the results you need to loop over the collection:
FOR j IN 1..results_tbl.COUNT loop
dbms_output.put_line(results_tbl(j));
END LOOP;
so the whole block becomes:
DECLARE
sql_qry VARCHAR2(1000) := NULL;
TYPE results IS
TABLE OF varchar2(4000);
results_tbl results;
BEGIN
FOR i IN (
SELECT
*
FROM
all_tab_columns
WHERE
owner = 'OWNER_XYZ'
AND upper(column_name) LIKE '%COLUMN_XYZ%'
ORDER BY
table_name,
column_name
) LOOP
sql_qry := ' SELECT DISTINCT '
|| i.column_name
|| ' as column_name '
|| ' FROM '
|| i.owner
|| '.'
|| i.table_name
|| ' WHERE SUBSTR('
|| i.column_name
|| ',1,1) = ''Y''';
EXECUTE IMMEDIATE sql_qry BULK COLLECT
INTO results_tbl;
FOR j IN 1..results_tbl.COUNT loop
dbms_output.put_line(results_tbl(j));
END LOOP;
END LOOP;
END;
/
However, you can also do this without PL/SQL, using a variation on an XML trick. You can get the results of the dynamic query as an XML document using something like:
select dbms_xmlgen.getxmltype(
'select distinct "' || column_name || '" as value'
|| ' from "' || owner || '"."' || table_name || '"'
|| ' where substr("' || column_name || '", 1, 1) = ''Y'''
)
from all_tab_columns
where owner = 'OWNER_XYZ'
and upper(column_name) like '%COLUMN_XYZ%';
and then extract the value you want from that:
with cte (xml) as (
select dbms_xmlgen.getxmltype(
'select distinct "' || column_name || '" as value'
|| ' from "' || owner || '"."' || table_name || '"'
|| ' where substr("' || column_name || '", 1, 1) = ''Y'''
)
from all_tab_columns
where owner = 'OWNER_XYZ'
and upper(column_name) like '%COLUMN_XYZ%'
)
select x.value
from cte
cross apply xmltable(
'/ROWSET/ROW'
passing cte.xml
columns value varchar2(4000) path 'VALUE'
) x;
You can also easily include the table each value came from if you want that information (and the owner, and actual column name, etc.).
db<>fiddle showing both approaches.