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?PostgreSQL?????????????????????????????????????????????????????????
PostgreSQL ??????????????????????????????????????????????????????????????????????????????????????????????
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CURRENT_DATE???????????????CURRENT_TIME???????????????CURRENT_TIMESTAMP???????????CURRENT_TIME(precision)?????????????LOCALTIME?????????????????LOCALTIMESTAMP????????????????????????????????????????????????????????????
???????????????????
now()????????????????????timeofday()???????????????????statement_timestamp()??????????????????????????????????????????????????????
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highgo=# begin;BEGINhighgo=# select now(); now------------2023-10-18 14:22:45.678901+08:00 (1 row)highgo=# select statement_timestamp();statement_timestamp------------2023-10-18 14:22:47.890123+08:00 (1 row)
??????????? now() ? statement_timestamp() ???????????now() ????????????????? statement_timestamp() ????????????????
????????????PostgreSQL ?????????????????????????
highgo=# create table t(date date);CREATE TABLEhighgo=# insert into t values (date '2023-10-18');INSERT 0 1
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highgo=# insert into t values (timestamp '2023-10-18 14:22:45.678901+08:00');INSERT 0 1
???????PostgreSQL???????? ISO, MDY?????????????????????
highgo=# set datestyle = 'YMD';
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highgo=# select time '12:09:00.123456';time---------12:09:00.123456 (1 row)
???????MySQL ????????? PostgreSQL ????????
? PostgreSQL ???????????????????????????????????????????????????????? CURRENT_TIMESTAMP ? LOCALTIMESTAMP?????????????????? now() ? timeofday()?
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