![]() Julian Date (integer days since NovemBC at local midnight see Section B.7) Week number of ISO 8601 week-numbering year (01–53 the first Thursday of the year is in week 1)Ĭentury (2 digits) (the twenty-first century starts on ) Week number of year (1–53) (the first week starts on the first day of the year) ![]() Week of month (1–5) (the first week starts on the first day of the month) ISO 8601 day of the week, Monday ( 1) to Sunday ( 7) Last digit of ISO 8601 week-numbering yearįull upper case month name (blank-padded to 9 chars)įull capitalized month name (blank-padded to 9 chars)įull lower case month name (blank-padded to 9 chars)Ībbreviated upper case month name (3 chars in English, localized lengths vary)Ībbreviated capitalized month name (3 chars in English, localized lengths vary)Ībbreviated lower case month name (3 chars in English, localized lengths vary)įull upper case day name (blank-padded to 9 chars)įull capitalized day name (blank-padded to 9 chars)įull lower case day name (blank-padded to 9 chars)Ībbreviated upper case day name (3 chars in English, localized lengths vary)Ībbreviated capitalized day name (3 chars in English, localized lengths vary)Ībbreviated lower case day name (3 chars in English, localized lengths vary)ĭay of ISO 8601 week-numbering year (001–371 day 1 of the year is Monday of the first ISO week)ĭay of the week, Sunday ( 1) to Saturday ( 7) Last 2 digits of ISO 8601 week-numbering year Last 3 digits of ISO 8601 week-numbering year ISO 8601 week-numbering year (4 or more digits) (See also to_timestamp(double precision) in Table 9.33.) To_timestamp ( text, text ) → timestamp with time zoneĬonverts string to time stamp according to the given format. To_char(interval '15h 2m 12s', 'HH24:MI:SS') → 15:02:12Ĭonverts number to string according to the given format available for integer, bigint, numeric, real, double precision.Ĭonverts string to date according to the given format.Ĭonverts string to numeric according to the given format. To_char(timestamp ' 17:31:12.66', 'HH12:MI:SS') → 05:31:12Ĭonverts interval to string according to the given format. PostgreSQL provides various built-in data types, and casting is essential for transforming values between these types as needed in various queries and operations.To_char ( timestamp with time zone, text ) → textĬonverts time stamp to string according to the given format. Not all casts are valid, and some conversions might result in errors if the data types are not compatible. SELECT CAST(1 AS BOOLEAN) - Casts an integer to BOOLEAN (true) SELECT CAST('false' AS BOOLEAN) - Casts a string to BOOLEAN (false) ![]() Casting Between Boolean and Other Types:.SELECT CAST('42' AS INTEGER) - Casts a string to an integer SELECT CAST('3.14' AS FLOAT) - Casts a string to a floating-point number ![]() SELECT CAST('' AS DATE) - Casts a string to a DATE type SELECT CAST('15:30:00' AS TIME) - Casts a string to a TIME type SELECT CAST(12345 AS VARCHAR) - Casts the integer to a string SELECT CAST(5.75 AS INTEGER) - Casts the decimal value to an integer Here are a few examples of how you can use the CAST function in PostgreSQL: Where expression is the value or expression that you want to cast.Īnd target_data_type is the data type to which you want to cast the expression. The basic syntax of the CAST function in PostgreSQL is as follows: This can be useful to perform operations that require compatible data types or when you need to ensure that the data is presented in a specific format. It allows you to change the data type of a value, expression, or column to a different data type. The CAST function is used to explicitly convert a value from one data type to another.
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