Derby supports limiting the number of rows returned by a query through - JDBC. + JDBC. For example, to fetch the first 5 rows of a large table:
+ +
+ Statement stmt = con.createStatement();
+ stmt.setMaxRows(5);
+ stmt.execute("SELECT * FROM myLargeTable");
+
+ Some related tuning tips are available in + this + external article. +
+
+ Starting with the 10.4.1.3 release Derby also supports limiting the number of
+ rows using the ROW_NUMBER function.
+
+ For example, to fetch the first 5 + rows of a large table: +
+
+ SELECT * FROM (
+ SELECT ROW_NUMBER() OVER() AS rownum, myLargeTable.*
+ FROM myLargeTable
+ ) AS tmp
+ WHERE rownum <= 5;
+
+ The ROW_NUMBER function can also be used to select a
+ limited number of rows starting with an offset, for example:
+
+ SELECT * FROM (
+ SELECT ROW_NUMBER() OVER() AS rownum, myLargeTable.*
+ FROM myLargeTable
+ ) AS tmp
+ WHERE rownum > 200000 AND rownum <= 200005;
+
+ For more information, refer to the ROW_NUMBER built-in function in + the Derby Reference Manual (available from the + Documentation page). Development + notes are available on the + OLAPRowNumber + wiki page. +
+
+ The LIMIT keyword is not defined in the SQL standard,
+ and is currently not supported.
+