We have table 1 (t1) and table 2 (t2) full of text/num strings. I need to write a query that will return all the...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
records in t2 that have an entry in t1 leading the string. For example,
t1 has [ab01, ab02] and
t2 has [ab01234, ab02345, ab01, ab02, ac01]
I would like the query to see if there is anything in t2 that starts with anything in t1.
result [ab01234, ab02345, ab01, ab02]
It looks like your t1 table has 4-character fields. If this is the case, then try the following join --
select t2.* from t1 inner join t2 on t1.entry = substring(t2.entry,1,4)
This query performs an ordinary inner join.
If the entries in t1 are not all 4 characters in length, then you would need to use TRIM() to grab however many leftmost non-blank characters there are in the t1 field, and use LENGTH() to determine how many characters to match on the t2 field --
select t2.* from t1 inner join t2 on trim(t1.entry) = substring(t2.entry,1,length(trim(t1.entry)))
For More Information
- What do you think about this answer? E-mail the edtiors at editor@searchDatabase.com with your feedback.
- The Best SQL Web Links: tips, tutorials, scripts, and more.
- Have an SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.
Dig Deeper on Oracle and SQL
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.