摘要: The following is a list of valid parameters when the to_char function is used to convert a date to a string. These parameters can be used in many combinations.
Parameter Explanation
YEAR Year, spelled out
YYYY 4-digit year
YYY
YY
Y Last 3, 2, or 1 digit(s) of year.
IYY
IY
I Last 3, 2, or 1 digit(s) of ISO year.
IYYY 4-digit year based on the ISO standard
Q Quarter of year (1, 2, 3, 4; JAN-MAR = 1).
MM Month (01-12; JAN = 01).
MON A
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