New answers tagged upgrade
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Can you do select f.* from civicrm_mapping_field f left join civicrm_mapping m on f.mapping_id = m.id where m.id is null. I suspect you have some fields where the mapping_id points to a mapping that doesn't exist and that query will locate them.
If that query does show you some rows, then since the mapping doesn't exist anyway you could just delete those ...
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Issue caused by empty timestamps in 'civicrm_note' according to this
The fix: run MySQL query before upgrade or if/when upgrade stuck.
In my case, this page http://example.org/civicrm/upgrade?reset=1 throws the MySQl error but after running the query below and refreshing the http://example.org/civicrm/upgrade?reset=1 it all went well.
UPDATE `civicrm_note`
...
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It may take some trial and error and going in steps. The CMS will also make a difference how you break up the steps. At some point you'll need to upgrade php to 7.x, but for some of the intermediate civi versions you might not want to go past php 7.1 or 7.2.
See also https://docs.civicrm.org/sysadmin/en/latest/upgrade/version-specific/ for some steps you ...
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