The date_part('text', timestamp) function returns a double-precision number based on the requested unit, such as "hour". This function is equivalent to extract(field from timestamp), except for the quoting requirements on the unit and the presence of "from". The extract function can also ...
select date_part('year',age(SUBSTR('13092919931001xxxx', 7, 8)::timestamp)) as age; --查看数据库版本(SQL方式) SELECT version();或者show server_version; --查看数据库版本(pg_config方式) pg_config|grep VERSION --字符串截取 SELECT substr('15388997755', 1, 3); --字符拼接 SELECT concat(...
age(timestamp) interval 从current_date减去得到的数值 age(timestamp '1957-06-13') 43 years 8 mons 3 days current_date date 今天的日期 current_time time 现在的时间 current_timestamp timestamp 日期和时间 date_part(text, timestamp) double 获取子域(等效于extract) date_part('hour', timest...
psql -c "CREATE TABLE tab_\$dateStr (LIKE tab INCLUDING INDEXES); ALTER TABLE tab ATTACH PARTITION tab_\$dateStr FOR VALUES IN ('\$dateStr')"; EOF (crontab -l2>/dev/null;echo"0 14 * * * bash /tmp/create_part.sh ")|crontab- 使用数据库内置调度器,如 pg_cron、pg_timetable 以p...
CREATEORREPLACEFUNCTIONdate_part(text,abstime)RETURNSdouble precisionAS'select pg_catalog.date_part($1, cast($2 as timestamp with time zone))'LANGUAGEsqlSTABLESTRICTCOST1;ALTERFUNCTIONdate_part(text,abstime)OWNERTOhighgo;COMMENTONFUNCTIONdate_part(text,abstime)IS'extract field from abstime'; ...
DATE_CREATED timestamp NOT NULL DEFAULT now() ) PARTITION BY RANGE(DATE_CREATED); alter table public.RANPARTITION1 add primary key(id,DATE_CREATED) --创建分区表 create table RANPARTITION1_202401 partition of RANPARTITION1 for values from ('2024-01-01 00:00:00') to ('2024-02-01 00:00...
Maximum size of a TOAST chunk: 1996 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value · postgresql.conf中的配置信息 wal_level setting: replica wal_log_hints setting: on max_connections setting: 1000 ...
CREATE TABLE part_range ( order_id int, name varchar(50) NULL, saledate timestamp NOT NULL DEFAULT now()) PARTITION BY RANGE(saledate);alter table part_range add primary key(id,saledate);\d+ part_range 2、创建分区表 create table p1_202401 partition of part_range for values from ('20...
PostgreSQL , Oracle , 兼容性 , timestamp , interval , 时间相减 , numeric 背景 Oracle 时间相减,得到的是一个浮点值N,代表N天。 PostgreSQL 时间相减,得到的是一个时间间隔类型,但是可以转换为一个浮点值。 Oracle 例子 SQL>selectsysdate - to_date('2017-01-01','yyyy-mm-dd')fromdual; ...
DATE_PART() functionThe PostgreSQL DATE_PART() function is used to extract a specific part of a date and time value, such as the year, month, day, hour, minute, second, etc.Uses of DATE_PART() FunctionExtract Year: Retrieve the year part from a timestamp or date. Extract Month: ...