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Amazon Redshift
Database Developer Guide (API Version 2012-12-01)

extra_float_digits

Values (Default in Bold)

0, -15 to 2

Description

Sets the number of digits displayed for floating-point values, including float4 and float8. The value is added to the standard number of digits (FLT_DIG or DBL_DIG as appropriate). The value can be set as high as 2, to include partially significant digits; this is especially useful for outputting float data that needs to be restored exactly. Or it can be set negative to suppress unwanted digits.