Tag Archives: DB2

DB2 Row generator

Sometimes you need a mechanism to generate rows. For example when you need to create a demonstration table . Recursive CTE’s (Common Table Expression) might be your friend   WITH engine (rownum) AS (select 1 as rownum from sysibm.sysdummy1 union all select rownum + 1 AS rownum from engine where rownum<10) SELECT rownum FROM engine; …

DB2 commands

Starting the database [db2inst1@bloemkool ~]$ db2start 01/11/2022 14:57:48 0 0 SQL1063N DB2START processing was successful. SQL1063N DB2START processing was successful. [db2inst1@bloemkool ~]$ Stopping the database [db2inst1@bloemkool ~]$ db2stop 01/11/2022 14:58:43 0 0 SQL1064N DB2STOP processing was successful. SQL1064N DB2STOP processing was successful. [db2inst1@bloemkool ~]$ Stopping the database when there are connections/applications in the database.At first …

Recursive SQL in DB2

Problem Playing around in DB2 I wanted to know how to create a hiearchical query. This because I wanted to create view for explain plans, a bit resembling the explain plans which oracle provides. First step is understanding how to make the recursive SQL’s The setup: drop table relations; create table relations (id int, parent …