![]() ( lz4 is available only if -with-lz4 was used when building PostgreSQL. The supported compression methods are pglz and lz4. (See ALTER TABLE for information on column storage modes.) Setting this property for a partitioned table has no direct effect, because such tables have no storage of their own, but the configured value will be inherited by newly-created partitions. Compression is supported only for variable-width data types, and is used only when the column's storage mode is main or extended. However, looks like Postgres 9.6 doesn't have it. I am from Tsql world and it has this checking. 'CREATE SOMETHING IF NOT EXISTS' perfectly working with tables sequences and others, however cannot find the solution for functions. The COMPRESSION clause sets the compression method for the column. The plan is to run a script to check if the object exists, do nothing if it doesn't it will create it. DROP TRIGGER IF EXISTS mytrigger ON mytable As Jack points out in the comments, this feature has only been available since 8.2 this has been out for more than four years though, so it should be available in your version. Do this before creating the trigger, then it will always work. Use of EXTERNAL will make substring operations on very large text and bytea values run faster, at the penalty of increased storage space. Postgres can conditionally drop a trigger - see the docs. EXTENDED is the default for most data types that support non- PLAIN storage. Writing DEFAULT sets the storage mode to the default mode for the column's data type. ![]() EXTERNAL is for external, uncompressed data, and EXTENDED is for external, compressed data. In this approach, PostgreSQL will first see the name of the new data type as the return type of the input function. The way to create a new base type was to create its input function first. PLAIN must be used for fixed-length values such as integer and is inline, uncompressed. Before PostgreSQL version 8.2, the shell-type creation syntax CREATE TYPE name did not exist. This controls whether this column is held inline or in a secondary TOAST table, and whether the data should be compressed or not. This form sets the storage mode for the column.
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