https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-CURRENT 9.9.4. Current Date/Time PostgreSQL provides a number of functions that return values related to the current date and t
PostgreSQL日期函数备忘http://www.postgresql.org/docs/current/static/functions-formatting.htmlDate/Time Functions and OperatorsTable 9-27shows the available
date_part ( text, interval ) → double precision 获取时间间隔子字段(等同于extract)。 date_part('month', interval '2 years 3 months')→ 3 date_trunc ( text, timestamp ) → timestamp 截断到指定的精度。 date_trunc('hour', timestamp '2001-02-16 20:38:40')→ 2001-02-16 20:00:00...
This topic provides reference information about date and time functions in PostgreSQL compared to Microsoft SQL Server, which is valuable for database administrators and developers migrating from SQL Server to Amazon Aurora PostgreSQL. You can understand the differences in ...
Comment information functions Database object location functions Database object size functions Date/Time functions and operators CLOCK_TIMESTAMP() JUSTIFY_DAYS(), JUSTIFY_HOURS(), JUSTIFY_INTERVAL() PG_SLEEP() TRANSACTION_TIMESTAMP() ENUM support functions ...
stat_statements | 1.10 | public | track planning and execution statistics of all SQL statements executedplpgsql | 1.0 | pg_catalog | PL/pgSQL procedural languagetablefunc | 1.0 | public | functions that manipulate whole tables, including crosstab | {} 6、显示模式...
TIME –use the TIME datatype to manage the time of day values. UUID –guide you on how to use UUID datatype and how to generate UUID values using supplied modules. Array –show you how to work with arrays and introduce you to some handy functions for array manipulation. hstore –introdu...
Working with current dates and times in data science projects is quite common. In this episode of mySQL tutorial seriesI’ll show you the best functions that return the actual time and date— or part of them. I won’t just show you theSQL current datefunction, but many alternatives, so ...
操作符AND和OR是可交换的,也就是说,你可以交换左右操作数而不影响结果。 2. 比较函数和操作符 常见的比较操作符都可用,如Table 9-1所示。 Table 9-1. 比较操作符 Note: !=操作符在分析器阶段被转换成<>。不能把!=和<>操作符实现为做不同的事。
(NULL in => NULL out) */bool fn_retset;/* function returns a set */unsigned char fn_stats;/* collect stats if track_functions > this */void*fn_extra;/* extra space for use by handler */MemoryContext fn_mcxt;/* memory context to store fn_extra in */fmNodePtr fn_expr;/* ...