sql-merge - Read For Learn

ORA-30926: unable to get a stable set of rows in the source tables

This is usually caused by duplicates in the query specified in USING clause. This probably means that TABLE_A is a parent table and the same ROWID is returned several times. You could quickly solve the problem by using a DISTINCT in your query (in fact, if ‘Y’ is a constant value you don’t even need … Read more

How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?

9.5 and newer: PostgreSQL 9.5 and newer support INSERT … ON CONFLICT (key) DO UPDATE (and ON CONFLICT (key) DO NOTHING), i.e. upsert. Comparison with ON DUPLICATE KEY UPDATE. Quick explanation. For usage see the manual – specifically the conflict_action clause in the syntax diagram, and the explanatory text. Unlike the solutions for 9.4 and older that are given below, this feature works with … Read more