Синтаксис литерала интервала

Следующий синтаксис используется для литерала интервалов в ODBC.

interval-литерал ::= INTERVAL [+|-] interval-string interval-qualifier

interval-string ::= quote { year-month-literal day-time-literal | } quote

year-month-literal ::= year-value | [значение года -] месяц-значение

day-time-literal ::= day-time-interval-time-interval-interval |

day-time-interval ::= days-value [hours-value [:minutes-value[:seconds-value]]

интервал времени ::= hours-value [:minutes-value [:seconds-value ]

| minutes-value [:seconds-value ]

| значение секунд

years-value ::= datetime-value

months-value ::= datetime-value

days-value ::= datetime-value

hours-value ::= datetime-value

minutes-value ::= datetime-value

значение секунд ::= секунды-целочисленное значение [.[доля секунд] ]

seconds-integer-value ::= unsigned-integer

секунды дроби ::= unsigned-integer

datetime-value ::= unsigned-integer

interval-qualifier ::= start-field TO end-field | single-datetime-field

start-field ::= non-second-datetime-field [(interval-leading-field-precision)]

end-field ::= non-second-datetime-field | SECOND[(interval-fractional-seconds-precision)]

single-datetime-field ::= non-second-datetime-field [(interval-leading-field-precision)] | SECOND[(interval-leading-field-precision [, (interval-fractional-seconds-precision)]

datetime-field ::= non-second-datetime-field | ВТОРОЙ

non-second-datetime-field ::= YEAR | MONTH | DAY | ЧАС | МИНУТУ

interval-fractional-seconds-precision := unsigned-integer

interval-leading-field-precision ::= unsigned-integer

цитата ::= '

unsigned-integer ::= digit...