AndOp 函数返回两个日历模式的交集。
AndOp ( cal_patt1 CalendarPattern,
cal_patt2 CalendarPattern)
returns CalendarPattern;
此函数返回的日历模式中所包含的每个时间间隔都处于启用状态,并且都是两个日历模式中已启用的时间间隔;其余时间间隔处于禁用状态。如果给定模式没有相同的时间间隔单位,那么具有较大时间间隔单位的模式将通过扩展来与其他模式匹配。
由 AND 运算符组合两个其他日历模式而形成的一个日历模式。
select * from CalendarPatterns
where cp_name = 'workweek_day';
cp_name workweek_day
cp_pattern {1 off,5 on,1 off},day
select * from CalendarPatterns
where cp_name = 'fourday_day';
cp_name fourday_day
cp_pattern {1 off,4 on,2 off},day
select * from CalendarPatterns
where cp_name = 'workweek_hour';
cp_name workweek_hour
cp_pattern {32 off,9 on,15 off,9 on,15 off,9 on,15 off, 9
on,15 off,9 on,31 off},hour
select AndOp(p1.cp_pattern, p2.cp_pattern)
from CalendarPatterns p1, CalendarPatterns p2
where p1.cp_name = 'workweek_day'
and p2.cp_name = 'fourday_day';
(expression) {1 off,4 on,2 off},day
select AndOp(p1.cp_pattern, p2.cp_pattern)
from CalendarPatterns p1, CalendarPatterns p2
where p1.cp_name = 'workweek_hour'
and p2.cp_name = 'fourday_day';
(expression) {32 off,9 on,15 off,9 on,15 off,9 on,15 off,9
on,55 off},hour