Postgres: data types - How to store uint64 in postresql

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Bigint in postgresql is 8 byte integer. which is has half the range as uint64 (as one bit is used to sign the integer)

I need to do a lot of aggregation on the column and I am under the impression that aggregation on NUMERIC type is slow in comparison to integer types.

How should I optimize my storage in this case?

Unless you have a concrete reason, just use NUMERIC. It is slower, quite a lot slower, but that might not matter as much as you think.

You don't really have any alternative, as PostgreSQL doesn't support unsigned 64-bit integers at the SQL level. You could add a new datatype as an extension module, but it'd be a lot of work.

You could shove the unsigned 64-bit int bitwise into a 64-bit signed int, so values above maxuint64/2 are negative. But that'll be totally broken for aggregation, and would generally be horribly ugly.

Documentation: 8.4: Numeric Types, double precision, 8 bytes, variable-precision, inexact, 15 decimal digits precision The types smallint, integer, and bigint store whole numbers, that is, numbers� PostgreSQL has a rich set of native data types available to users. Users can add new types to PostgreSQL using the CREATE TYPE command. Table 8-1 shows all the built-in general-purpose data types. Most of the alternative names listed in the "Aliases" column are the names used internally by PostgreSQL for historical reasons. In addition, some

sum() will return numeric if the input is bigint so it will not overflow

select sum(a)
from (values (9223372036854775807::bigint), (9223372036854775807)) s(a)
;
         sum          
----------------------
 18446744073709551614

http://www.postgresql.org/docs/current/static/functions-aggregate.html

Documentation: 9.5: Data Types, Most of the alternative names listed in the "Aliases" column are the names used internally by PostgreSQL for historical reasons. In addition, some internally used � Wave 2: PostgreSQL 9.4 (2014) added support for JSONB data type JSONB stands for "JSON Binary" or "JSON better" depending on whom you ask. It is a decomposed binary format to store JSON.

There is also an extension to provide an additional uint64 datatype in postgresql. See Github

It is by Peter Eisentraut

A Look At Various PostgreSQL Integer Data Types, The SMALLINT requires 2 bytes storage size which can store any integer numbers that is in the range of (-32,767, 32,767). You can use the SMALLINT type for� The PostgreSQL variable is a convenient name or an abstract name given to the memory location. The variable always has a particular data-type give to it like boolean, text, char, integer, double precision, date, time, etc. They are used to store the data which can be changed.

Storing uint64 values in DB, Neither PostgreSQL[1] nor SQLite[2] support unsigned 64-bit integers at the / 21909027/postgres-data-types-how-to-store-uint64-in-postresql. PostreSQL does not store column statistics for JSONB columns. PostgreSQL maintains statistics about the distributions of values in each column of the table - most common values (MCV), NULL entries, histogram of distribution. Based on this data, the PostgreSQL query planner makes smart decisions on the plan to use for the query.

Supported Types and their Mappings, Neither PostgreSQL[1] nor SQLite[2] support unsigned 64-bit integers at the / 21909027/postgres-data-types-how-to-store-uint64-in-postresql. Note: Prior to PostgreSQL 7.3, serial implied UNIQUE. This is no longer automatic. If you wish a serial column to have a unique constraint or be a primary key, it must now be specified, just like any other data type.

Entity Framework Data Type Mapping, PostgreSQL type, Default .NET type, Provider-specific type, Other .NET types cid, uint. oidvector, uint[]. name, string, char[]. (internal) char, char, byte, short, int, long other CLR types which Npgsql supports for the PostgreSQL data type. Data Types . This document discusses PostgreSQL Data Types. While creating table, for each column, you specify a data type, i.e. what kind of data you want to store. This enables several benefits: Consistency: A column can can store a single type of value.

Comments
  • Are you sure your operation will overflow a signed 64-bit counter? Why do you think it won't overflow an unsigned 64-bit counter?
  • There's also the varint extension found on PGXN