postgresql中怎么查看函数

在PostgreSQL客户端psql中,可以使用df查看数据库搜索路径下的所有函数:

**postgres=# df**
                               List of functions
 Schema |       Name    |    Result data type   |

    Argument data types
                                    |  Type
--------+-----------------------+--------------------+--------------------------
---------------------------------------------------------------------------------
-----------------------------------------------------------------------------------
-------------------------------------------------------------------------+---------
 public | __arima_adjust|double precision[]|distid integer,
 curr_tvals double precision[], prev_tvals double precision[], p integ
er

                                      | normal
 public | __arima_diff

因为PostgreSQL中的函数有四种分类:aggregates/normal/trigger/window functions,所以psql中提供了附加参数,分别用来显示对应的函数:dfa、dfn、dft、dfw:

postgres=# dft
                               List of functions
 Schema |        Name        | Result data type | Argument data types |  Type
--------+--------------------+------------------+---------------------+---------
 public | checkauthtrigger   | trigger          |                     | trigger
 public | postgis_cache_bbox | trigger          |                     | trigger
(2 rows)

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