PostgreSQL Database Limits

The user guide states there is no limit to the precision that may be specified. real float4 A 4-byte, single-precision, ... This set of commands is taken from the psql command-line tool. Using psql, you can generate the complete list of commands by using the \help command. For the syntax of a specific command, use \help . More detailed explanations are available in Part VI (Reference ... ................
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