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 time. These SQL-standard functions all return values based on the start time of the curr...
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 ...
General \copyright show PostgreSQL usage and distribution terms \crosstabview [COLUMNS] execute query and display result in crosstab \errverbose show most recent error message at maximum verbosity \g [(OPTIONS)] [FILE] execute query (and send result to file or |pipe); \g with...
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。
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 ...
所有下文描述的接受time或timestamp输入的函数和操作符实际上都有两种变体:一种接收time with time zone或timestamp with time zone, 另外一种接受time without time zone或者timestamp without time zone。为了简化,这些变种没有被独立地展示。此外,+和``操作符都是可交换的操作符对(例如,date+integer和integer+dat...
(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;/* ...
\df[antw][S+] [PATRN] list [only agg/normal/trigger/window] functions \dF[+] [PATTERN] list text search configurations \dFd[+] [PATTERN] list text search dictionaries \dFp[+] [PATTERN] list text search parsers \dFt[+] [PATTERN] list text search templates ...
#track_functions = none # 启用跟踪函数调用计数和用时。 # 指定pl只跟踪过程语言函数 # 指定all还会跟踪 SQL 和 C 语言函数。 # 默认值是none,它禁用函数统计跟踪。 #stats_temp_directory = 'pg_stat_tmp' # 设置存储临时统计数据的目录。 # 这可以是一个相对于数据目录的路径或一个绝对路径。默认值是...