在PostgreSQL中,遇到错误消息 "postgresql function if(boolean, unknown, unknown) does not exist" 通常意味着你尝试使用一个不存在的 if 函数。实际上,PostgreSQL本身并不直接支持名为 if 的函数,这种语法更常见于其他编程语言如Java、C++等。在PostgreSQL中,你可以使用其他方法来实现类似的条件逻辑。 下面,我将根...
可以为虚拟表temp中的计算字段ifnull(comm,0.0)设置一个列别名来规避那个错误提示。请参考下列语句改法:select ename ,emp.sal ,emp.ifnull(comm,0.0) from emp,(select sal,ifnull(comm,0.0) a from emp where ename='scott') as temp where (emp.sal=temp.sal) and (emp.ifnull(comm...
Error in query: function if(boolean, numeric, unknown) does not exist LINE 1: select t2.item_code, t2.item_name,SUM(IF(t1.transaction_date... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts. Traceback (most recent call last)...
原因在于PostGresql并没有自带IFNULL函数,可以用COALESCE来替代IFNULL,且COALESCE功能更强大,可以输入更多参数,顺序判断并返回第一个非null值。 例如: SELECT COALESCE(NULL,0); -- return 0 SELECT COALESCE(NULL,NULL,0); -- return 0 SELECT COALESCE(NULL,NULL,2,1); -- return 2...
If a query result is displayed, the function belongs to a plugin. Theextnamefield in the query result indicates the plugin name. Go to2. If no query result is displayed, the function does not belong to any plugin and is a user-defined function. Go to3. ...
We compared that knowledge to the attention the diseases have received in medical research and on the Internet. Data were collected from 6 [translate] awords, if there does not exist a function having the form 词,如果那里不存在作用有形式 [translate] ...
哈哈， 这个情况我也遇到过。原因估计是 SUM 后面，不能有空格的缘故……估计 MySQL 某些版本有这个毛病。mysql> select SUM ( sale_money ) FROM sale_report;ERROR 1630 (42000): FUNCTION test.SUM does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference ...
</if> 原因分析:mysql中没有to_char函数,应该使用date_format,日期转为字符串使用 date_format(create_time,’%Y-%m-%d %H:%i:%s’) 修改如下: <iftest="startDate!=null and startDate!=''">AND date_format(o.order_time,'%Y-%m-%d') <![CDATA[>=]]>#{startDate}</if> ...
https://laracasts.com/discuss/channels/general-discussion/illuminatefoundationsupportprovidersfilterserviceprovider-not-found I've since done a fresh composer install, added the same requirements as above but this time no error. Sorry if it's a false alarm.work...
The func_find function returns a pointer to the function specified by name. If the function does not exist, func_find returns NULL.Syntax FuncPtr func_find(char *name);Return Values A pointer to the chosen function, suitable for de-referencing, or NULL if the function is not found....