date_part ( text, timestamp ) → double precision → double precisionGet timestamp subfield (equivalent to
extract); see Section 9.9.1date_part
Get timestamp subfield (equivalent to extract); see Section 9.9.1
English manual coverage begins with PostgreSQL 7.1. Source history and runtime observations have their own recorded version boundaries.
Reading PG 18·Select a recorded version
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- 时间/日期函数和操作符
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- functions-datetime.html
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Definition PG 18
Get timestamp subfield (equivalent to
extract); see Section 9.9.1Signatures and overloads
date_part ( text, interval ) → double precision → double precisionGet interval subfield (equivalent to
extract); see Section 9.9.1date_part('field', source)Note that here the field parameter needs to be a string value, not a name. The valid field names for date_part are the same as for extract. For historical reasons, the date_part function returns values of type double precision. This can result in a loss of precision in certain uses. Using extract is recommended instead.Compare versions
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center · PostgreSQL 18 · wiki-repair-20261023:d27ecdb70ee2703a71214aee024a074c078ec812ad16bfcfd1c494bee0d52899
Text language: en · wiki-repair-20261023:d27ecdb70ee2703a71214aee024a074c078ec812ad16bfcfd1c494bee0d52899