以下是PostgreSQL中常用的日期和时间戳数据类型: - **DATE**:用于存储日期,格式为 `YYYY-MM-DD`。 - **TIME**:用于存储时间,格式为 `HH:MM:SS`。 - **TIMESTAMP**:用于存储日期和时间,格式为 `YYYY-MM-DD HH:MM:SS`。 - **TIMESTAMPTZ**:用于存储带时区的日期和时间,格式为 `YYYY-MM-DD
2. last_day(日期) 指定日期当月的最后一天 3. new_time(日期,时区简写) 调整时区 4. next_day(日期,number) number表示周几,星期日是1,指定number的日期(一周内或一周后) 5. months_between(日期1,日期2) 日期1和日期2之间有几个月 6. sysdate 系统当期那日期和时间 === 1.TRUNC --- for dates ...
months_between(x1,x2) x为DATE类型的数据 返回两个日期相差的月份 为浮点数或整数 add_months(x,n) n为整数 next_day(x,des) 加入des为’星期日’ 那么返回该日期x的下一个星期日的日期 last_day(x) 返回x日期所在月的最后一天 round(x,des) des可以为’year’,‘month’,‘day’,‘mm’,‘hh’...
年 * @param beginTime 开始时间 * @param endTime 结束时间...> betweenDay =new ArrayList(); switch (statisticType){ case "1": //计算两个日期的间隔天数...beginTime, endTime,DateUtils.YYYY_MM_DD); break; case "2": //计算两个日期的间隔月份...beginTime, endTime,DateUtils.YYYY_MM);...
PostgreSQL Ryan BoozinPostgreSQL Using Common Table Expressions: Transforming and Analyzing Data in PostgreSQL, Part 2 In the first article in this transforming data series, I discussed how powerful PostgreSQL can be in ingesting and transforming... ...
BETWEEN SYMMETRIC和BETWEEN相似,不过BETWEEN SYMMETRIC不要求AND左边的参数小于或等于右边的参数。如果左参数不是小于等于右参数,这两个参数会自动被交换,这样总是会应用一个非空范围。 当有一个输入为空时,普通的比较操作符会得到空(表示"未知"),而不是真或假。例如,7 = NULL得到空,7 <> NULL也一样。如果这...
These include traditional data types for storing Integers, Characters or Strings, Dates with Timestamps and Time Zones, as well as Boolean, Float, Decimal, Large Text, and BLOB for binary data storage like images. Notably, MySQL does not offer support for Geometric data types. JS...
-- 整数型 dates integer[] -- 字符串类型 names text[] 二维数组 dates integer[][] names text[][] 可以指定数组大小,但数据库不会对输入做任何限制,跟不设置大小没有区别 names text[10] 创建表结构 CREATE TABLE sal_emp ( name text, pay_by_quarter integer[], schedule text[][] ); 写入数据...
1. pg_partman_bgw.interval: Number of seconds between calls to run_maintenance(). The default is 3600 (1 hour). –For time-based partitions, intervals can be chosen based on the partition interval at least daily or twice daily. –For serial-based partitions, you can choose the partition ...
Some related utility functions (such as how to convert between cases in the encoding). Date-time format setting The string collation to use Currency format setting Paper size setting Locales on POSIX systems have names that look like: fr_BE.UTF-8 fr defines the langauge (French), ...