如题，Postgresql语句实现条件"每月第一个星期一"这一条件：
select 'Today is the first Monday of this month' where EXTRACT(DOW FROM now())=1 and EXTRACT(DAY from now()) < 7;
@H_404_5@
EXTRACT(DOW FROM now())表示从当前时间戳中获取星期几（Day Of the Week，范围为0-6,0表示星期日）；EXTRACT(DAY FROM now())表示从当前时间戳中获取当月第几天（范围为1-31,0）。@H_404_5@ @H_404_5@
