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2daeba6a4e
Add examples showing use of a CTE and a self-join to perform partial UPDATEs and DELETEs. Corey Huinker, reviewed by Laurenz Albe Discussion: https://postgr.es/m/CADkLM=caNEQsUwPWnfi2jR4ix99E0EJM_3jtcE-YjnEQC7Rssw@mail.gmail.com