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  • PG cannot execute UPDATE in a read-only transaction | How to add column if not exists on PostgreSQL

      PG cannot execute UPDATE in a read-only transaction出现这种情况时,说明SQL语句可能是运行在一个PG集群中的非master节点上。查看data/pg_hba.conf。

      SELECT pg_is_in_recovery();

       This cannot return true in a master server because the only time a master server can be in recovery。

      还有如下可能Normally the most plausible reasons for this kind of error are :

    • trying create statements on a read-only replica (the entire instance is read-only).

    • <username> has default_transaction_read_only set to ON

    • the database has default_transaction_read_only set to ON

      alter database exercises set default_transaction_read_only = off;

          https://stackoverflow.com/questions/31186414/error-cannot-execute-create-table-in-a-read-only-transaction

      How to add column if not exists on PostgreSQL

      With Postgres 9.6 this can be done using the option if not exists

      ALTER TABLE table_name ADD COLUMN IF NOT EXISTS column_name INTEGER;

      https://stackoverflow.com/questions/12597465/how-to-add-column-if-not-exists-on-postgresql

     

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  • 原文地址:https://www.cnblogs.com/lnlvinso/p/10035150.html
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