How do you find a certain number of records in SQL?
MySQL supports the LIMIT clause to select a limited number of records, while Oracle uses FETCH FIRST n ROWS ONLY and ROWNUM .
- SQL Server / MS Access Syntax: SELECT TOP number|percent column_name(s)
- MySQL Syntax: SELECT column_name(s)
- Oracle 12 Syntax:
- Older Oracle Syntax:
- Older Oracle Syntax (with ORDER BY):
How does MySQL determine gaps in sequential numbering?
1 Answer
- SELECT (t1.id + 1) as gap_starts_at,
- (SELECT MIN(t3.id) -1 FROM arrc_vouchers t3 WHERE t3.id > t1.id) as gap_ends_at.
- FROM arrc_vouchers t1.
- WHERE NOT EXISTS (SELECT t2.id FROM arrc_vouchers t2 WHERE t2.id = t1.id + 1)
- HAVING gap_ends_at IS NOT NULL.
- gap_starts_at – first id in current gap.
How to find missing records from two databases?
I am trying to compare total number of records for a particular table in two databases. They are from the same database, but both the database are running in two different servers. Table structure is same on both the tables , but no of records varies on both the tables.
How to find missing sequence numbers in SQL?
How about something like: select (select isnull (max (val)+1,1) from mydata where val < md.val) as [from], md.val – 1 as [to] from mydata md where md.val != 1 and not exists ( select 1 from mydata md2 where md2.val = md.val – 1) I know this is a very old post but I wanted to add this solution that I found HERE so that I can find it easier:
Where do I Find my donorid in SQL?
The DonationRecords table contains entries in the DonorID column for Jeff (DonorID 1), Kim (DonorID 2), and Angela (Donor ID3), as well as three entries for someone whose DonorID is 6. Figure B shows the results of this query.
What happens when you do a left join in SQL?
When we executed the LEFT JOIN, the query returned all of the values from the Donors table (the one on the left), even if there wasn’t a corresponding record in the DonationRecords table. It returns all of the records from both tables that contain matching values, as defined by the ON clause.