[Last Call] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 228
  • Last Modified:

Delphi 3->SQL->SQLBase 7

I'm using Delphi 3.0 to ask a SQLbase 7 Database.
And I want to know if it exist a direct SQL expression to select the last one created row on a SQLBase7 Table.
Like in ACCESS :
SELECT LAST(column_name) FROM table_name;
0
nk51
Asked:
nk51
1 Solution
 
JaccoCommented:
No in real SQL such a thing doesn't exist. (Access isn't realy SQL) This is because a table can be sorted be all of its separate indices.

Now what you can do is if you know the index you sort on is the following:

SELECT
  Max(ColumnName1)
FROM
  TableName
WHERE
  ColumnName2 = (SELECT MAX(ColumnName2) FROM TableName)

This means for a database you have to define what your last item is. In the example you get the highest value of column1 where column2 is highest.

Several other solution are thinkable.

For example: Use a TTable component and do Table.Last; (this sometimes can be very slow though, watch the SQL monitor)

Regards Jacco

(P.S. Does your database system have stored procedure, I have a solution using these)
0
 
nk51Author Commented:
My database system doesn't have stored procedure.
Thanks for your help.

0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now