http://www.postgresql.org/docs/9.1/static/functions-datetime.html   Search Documentation:  Home → Documentation → Manuals → PostgreSQL 9.1 This page in other versions: 9.0 / 9.1 / 9.2 / 9.3 / 9.4  |  Development versions: devel  |  Unsupporte…

官网Functions and Operators部分 版本:0.266 目录 官网Functions and Operators部分 1 Comparison Functions and Operators is distinct from greatest/least any/all/some like 2 Conditional Expressions if nullif try 3 Lambda Expressions 4 Conversion Functions cast/try_ca…

一.Date/Time Types 参考文档:https://www.postgresql.org/docs/9.2/static/datatype-datetime.html Types 别名 timestamp [ (p) ] [ without time zone ] timestamp [ (p) ] with time zone timestamptz date time [ (p) ] [ without time zone ] time [ (p) ] with time zone…

PostgreSQL: The world's most advanced open source database https://www.postgresql.org/ POSTGRESQL: THE WORLD'S MOST ADVANCED OPEN SOURCE RELATIONAL DATABASE PostgreSQL: Documentation: 10: PostgreSQL 10.4 Documentation https://www.postgresql.org/docs/…

Hive Operators and User-Defined Functions (UDFs) Hive Operators and User-Defined Functions (UDFs) Built-in Operators Relational Operators Arithmetic Operators Logical Operators Complex Type Constructors Operators on Complex Types Built-in Functions M…

Built-in Operators Relational Operators The following operators compare the passed operands and generate a TRUE or FALSE value depending on whether the comparison between the operands holds. Operator Operand types       Description A = B All primitiv…

转自:https://www.postgresql.org/docs/9.6/xfunc-c.html 可以作为学习基于c编写pg extension 的资料 36.9. C-Language Functions User-defined functions can be written in C (or a language that can be made compatible with C, such as C++). Such functions are compiled into dy…

网上有比较复杂的方法:Date Formatting Functions   写了一个非常简单的代码 1: function formatDate(seconds, dateformat) 2: --http://wiki.interfaceware.com/569.html 3: seconds = tonumber(seconds) 4: dateformat = dateformat or "%Y-%m-%d %H:%M:%S" 5: 6: return os.date(date…

https://www.postgresql.org/docs/9.6/static/functions-json.html Search Documentation:  Home → Documentation → Manuals → PostgreSQL 9.6 This page in other versions: 9.2 / 9.3 / 9.4 / 9.5 / current (9.6)  |  Development versions: devel PostgreSQL 9.6.2…

Using Custom Functions in a Report  在报表中使用自己义函数   FastReport has a large number of built-in standard functions for use in report designs. FastReport also allows custom functions to be written and used. Functions are added using the "FastScript"…