Pattern matching in sql scripts

Question

Hi All,
I am trying to run some queries for database maintainence and to find out the number of rows inserted in a table on a day. These queries would be stored in a .sql file and a scheduler will trigger these files are regular intervals.
Amongst these queries , one query that we generally exceute in sql command line is:
select component, count(*) from test where timestamp like '%2010-11-30%' group by component order by count(*) desc;
This query gives me a list of components and the number of rows they inserted in 'test' table on a particular day. To fetch the data inserted on a particular day we manually give current date inside pattern matching string -> e.g where timestamp like '%2010-11-30%'
How can I use pattern matching (as in the above query) in my sql script. How can I fetch the current date and use it in the above sql for pattern matching.
Please help.

Answer 1

Assuming your timestamp column has a proper data type like DATE or TIMESTAMP then you should compare dates with dates or timestamps with timestamps. Not timesatamp with a string.
example
select component, count(*) cnt
from test
where timestamp>= trunc(sysdate)
and timestamp < trunc(sysdate) /* this line is only needed if you have timestamps in the future */
group by component
order by cnt desc;If your column is of the datatype timestamp then use SYSTIMESTAMP instead of SYSDATE.