/* retrieve the last character in the string */ dbms_output.put_line ( SUBSTR (greetings, -1, 1)); /* retrieve five characters, starting from the seventh position. */ dbms_output.put_line ( SUBSTR (greetings, 7, 5)); /* retrieve the remainder of the string, starting from the seco...
问使用pl/sql中的length/position传递的值构建固定长度的字符串EN1、今天发生了一件有意思的事情，传输...
13 /* retrieve the last character in the string */ 14 dbms_output.put_line ( SUBSTR (greetings, -1, 1)); 15 16 /* retrieve five characters, 17 starting from the seventh position. */ 18 dbms_output.put_line ( SUBSTR (greetings, 7, 5)); 19 20 /* retrieve the remainder of the ...
DECLAREgreetings varchar2(11):='hello world';BEGINdbms_output.put_line(UPPER(greetings));dbms_output.put_line(LOWER(greetings));dbms_output.put_line(INITCAP(greetings));/* retrieve the first character in the string */dbms_output.put_line(SUBSTR(greetings,1,1));/* retrieve the last characte...
如果我们有用其他语言编写的代码或业务逻辑,通常可以把其中的数组或集合直接转成PL/SQL的集合类型。 其他语言中的数组可以转成PL/SQL中的VARRAY。 其他语言中的集合和包(bags)可以转成PL/SQL中的嵌套表。 哈希表和其他无序查找表(unordered lookup table)可以转成PL/SQL中的关联数组。
/* retrieve the last character in the string */dbms_output.put_line(SUBSTR(greetings,-1,1));/* retrieve five characters, starting from the seventh position. */dbms_output.put_line(SUBSTR(greetings,7,5));/* retrieve the remainder of the string, starting from the second position. */dbms...
2.2 PL/SQL用户定义的子类型 子类型是另一种数据类型的子集,它称为基本类型。子类型具有与其基本类型相同的操作,但只有基本类型有效值的子集。 PL/SQL预定义包STANDARD中的几个子类型。 例如,PL/SQL预先定义子类型CHARACTER和INTEGER,如下所示: SUBTYPE CHARACTER IS CHAR; SUBTYPE INTEGER IS NUMBER(38,0); 可以...
In new applications, always use PLS_INTEGER for better performance. PL/SQL Character and String Types Character types let you store alphanumeric data, represent words and text, and manipulate character strings. CHAR You use the CHAR datatype to store fixed-length character data. How the data ...
-- Returns the value corresponding to the last key, in this -- case the population of Australia. END; / 关联数组能帮我们存放任意大小的数据集合,快速查找数组中的元素。它像一个简单的SQL表,可以按主键来检索数据。 因为关联数组的作用是存放临时数据,所以不能对它应用像INSERT和SELECT INTO这样的SQL语句...
BEGINdbms_output.put_line(UPPER(greetings));dbms_output.put_line(LOWER(greetings));dbms_output.put_line(INITCAP(greetings));/* retrieve the first character in the string */dbms_output.put_line ( SUBSTR (greetings, 1, 1));/* retrieve the last character in the string */dbms_...