SELECT 1 AS id FROM dual CONNECT BY level <= 1000000; 2. WITH子句中的函数 WITH子句声明部分可用来定义函数,如下所示。 WITH FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS BEGIN RETURN p_id; END; SELECT with_function(id) FROM test WHERE rownum = 1 / WITH_FUNCTION(ID) --- 1...
WITH_FUNCTION(ID) --- 1 p_id=1 SQL> 4. PL/SQL支持 PL/SQL并不支持该特点。如果视图在PL/SQL中使用将会报编译错误,如下所示。 BEGIN FOR cur_rec IN (WITH FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS BEGIN RETURN p_id; END; SELECT with_function(id) FROM test WHERE rownum ...
代码运行次数:0 WITHTEMPAS(SELECT'CHINA'NATION,'GUANGZHOU''CHINA','SHANGHAI'FROMDUALUNIONALLSELECT'CHINA'NATION,'BEIJING'CITY'USA'NATION,SELECT'USA'NATIONDUALUNIONALLSELECT'JAPAN'NATION,'TOKYO'CITYFROMDUAL)SELECTNATION,LISTAGG(CITY,',')WITHINGROUP(ORDERBYCITY)ASCITIESFROMTEMPGROUPBYNATION 运行结果: ...
除了储过程,TDSQL PG版还对存储函数进行了扩展,比如在函数上添加了对WITH FUNCTION语法的支持。以下图为例,select调用的add function函数只在此语句中有效,其他语句无效。如果系统中已经有同名函数,这个select语句中的WITH FUNCTION的优先级会高于其他同名函数。实现方式为:函数编译后不存入pg_proc,存入Query的结构体中...
场景一 delete from student where id = (select max(id) from student); [Err] 1093 - You can...
8、function A、lower、upper、substr select lower(‘abcABC’) from dual; select upper(‘abcABC’) from dual; substr(target, startIndex, length) select substr(‘abcABC’, 1, 3) from dual; B、chr、ascii 将数字安装ascii值转换成字符:select char(65) from dual; ...
8、function A、lower、upper、substr selectlower(‘abcABC’)fromdual; selectupper(‘abcABC’)fromdual; substr(target, startIndex, length) selectsubstr(‘abcABC’, 1, 3)fromdual; B、chr、ascii 将数字安装ascii值转换成字符:selectchar(65)fromdual; ...
8、function A、lower、upper、substr selectlower(‘abcABC’)fromdual; selectupper(‘abcABC’)fromdual; substr(target, startIndex, length) selectsubstr(‘abcABC’, 1, 3)fromdual; B、chr、ascii 将数字安装ascii值转换成字符:selectchar(65)fromdual; ...
查oracle文档中的语法，找了半天没找到，只有摸石头过河，发现这能这样才能成功：With FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS BEGIN RETURN p_id;END;x1 as (select sysdate f1 from dual),x2 as (select sysdate f2 from dual)SELECT with_function(100), f1,f2 FROM ...
oracle的function语法 ” 的推荐: 使用start_with function和collapse::fselect function 我们可以使用gvr library(collapse)wlddev %>% gvr("^O") %>% head OECD ODA1 FALSE 1167699972 FALSE 2320800023 FALSE 1128399964 FALSE 2377200015 FALSE 2959200136 FALSE 341839996 fsum可以在g中分组 fsum(gvr(wlddev, ...