Concatenation error - when i use text column value in where condition.

Question

Hi,
i am creating Materialized view using few columns from two tables and as per requirement i need to prepare select statement with where condition in another column.(new column)
i tried like below....
create materialized view MAIN
refresh force on demand
as
select
a.table_name,
a.column_name,
b.trial_name,
'select * from '||a.table_name||' where '||a.column_name|| ' = '|| b.trial_name||';' "QUERY"
from
exp_csv_tB a,
exp_csv_tr b;
a.table name value is : monitoring_table
a.column_name value is : study
b.trial_name = fty777
Materialized view created with extra column but it is not added '' (codes) to text value in where condition.
output which i got is :
select * from monitoring_table where study = fty777;
but
i need output like
select * from monitoring_table where study = 'fty777';
fty777 value should be in codes like 'fty777'. i read some articles but didnt get this example.
please help.

Answer 1

Try this:
CREATE MATERIALIZED VIEW main
REFRESH FORCE ON DEMAND
AS
SELECT
a.table_name,
a.column_name,
b.trial_name,
'select * from '||a.table_name||' where '||a.column_name|| ' = '''|| b.trial_name||'';'' "QUERY"
FROM
exp_csv_tb a,
exp_csv_tr b;
You have to give double single codes for semi-colons ..
Regards..