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docs/sys-catalogs/sys-table-overview.md

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[`pg_am`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-am.md)
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[`pg_amop`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-amop.md)
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[`pg_amproc`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-amproc.md)
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[`pg_appendonly`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-appendonly.md)
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[`pg_attribute_encoding`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-attribute-encoding.md)
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[`pg_attribute`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-attribute.md)
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[`pg_attridef`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-attridef.md)
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[`pg_auth_members`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-auth-members.md)
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[`pg_authid`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-authid.md)
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[`pg_cast`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-cast.md)
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[`pg_class`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-class.md)
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[`pg_constraint`](/docs/sys-catalogs/sys-tables/sys-tbl-pg-constraint.md)

docs/sys-catalogs/sys-tables/sys-tbl-pg-appendonly.md

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title: pg_appendonly
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# pg_appendonly
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The `pg_appendonly` table in the `pg_catalog` schema contains information about the storage options and other characteristics of append-optimized tables.
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|column|type|references|description|

docs/sys-catalogs/sys-tables/sys-tbl-pg-attribute.md

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title: pg_attribute
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# pg_attribute
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The `pg_attribute` table in the `pg_catalog` schema stores information about table columns. There will be exactly one `pg_attribute` row for every column in every table in the database. (There will also be attribute entries for indexes, and all objects that have `pg_class` entries.) The term attribute is equivalent to column.
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In a dropped column's `pg_attribute` entry, `atttypid` is reset to zero, but `attlen` and the other fields copied from `pg_type` are still valid. This arrangement is needed to address the situation where the dropped column's data type was later dropped, and so there is no `pg_type` row anymore. `attlen` and the other fields can be used to interpret the contents of a row of the table.
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title: pg_amproc
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# pg_amproc
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title: pg_appendonly
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---
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# pg_appendonly
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title: pg_attribute_encoding
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# pg_attribute_encoding
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title: pg_attribute
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# pg_attribute
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title: pg_attrdef
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# pg_attrdef
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title: pg_auth_members
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# pg_auth_members
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title: pg_authid
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# pg_authid
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title: pg_cast
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# pg_cast
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title: pg_class
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# pg_class
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title: pg_constraint
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# pg_constraint

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