PL/SQL strings could be either variables or literals. A string literal is enclosed within quotation marks. For example,'This is a string literal.' Or 'hello world' To include a single quote inside a string literal, you need to type two single quotes next to one another. For example,...
7 - PL/pgSQL 到 PL/vSQL 迁移指南 虽然Vertica PL/vSQL 在很大程度上与 PostgreSQL PL/pgSQL 兼容,但从 PostgreSQL PL/pgSQL 迁移时,存在一些易于解决的语义和 SQL 级别差异。 语言级别差异 下面列出了 Vertica PL/vSQL 与 PostgreSQL PL/pgSQL 之间的显著差异。在 Vertica PL/vSQL 中: 必须将PERFORM语...
PL/SQL now supports the complete range of syntax for SQL statements, such asINSERT,UPDATE,DELETE, and so on. If you received errors for valid SQL syntax in PL/SQL programs before, those statements should now work. See Also: Because of more consistent error-checking, you might find that so...
PL/SQL对大小写不敏感,所以,除了在字符串和字符中,小写字母和它对应的大写字母是等价的。 二、词法单元 PL/SQL包含很多词法单元(lexical unit),大致可以分为以下几类: 分隔符(简单符号和复合符号) 标识符,其中包括关键字 文字 注释 为改善可读性,我们可以用空格将词法单元分隔开。实际上,我们必须将相邻的...
A string literal might have been mistakenly enclosed in double quotes instead of single quotes, in which case PL/SQL considers it a quoted identifier. Action: Shorten the identifier. PLS-00115 this PRAGMA must follow the declaration of 'string' Cause: The pragma refers to a PL/SQL object...
执行部分是PL/SQL块中的指令部分,由关键字BEGIN开始,所有的可执行语句都放在这一部分,其他的PL/SQL块也可以放在这一部分。 异常处理部分(Exception section) 这一部分是可选的,在这一部分中处理异常或错误,对异常处理的详细讨论我们在后面进行。 PL/SQL块语法 ...
The second string to concatenate. string_n Optional. The nth string to concatenate. Returns The||operator returns a string value. Applies To The||operator can be used in the following versions of Oracle/PLSQL: Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i ...
In the preceding,command-stringis an expression yielding a string (of type text) that contains the command to be run. Thiscommand-stringvalue is sent to the SQL engine. No substitution of PL/pgSQL variables is done on the command string. The values of variables must be inserted in the co...
. PL/SQL是一种高性能的基于事务处理的语言,能运行在任何ORACLE环境中,支持所有数据处理命令。通过使用 PL/SQL程序单元处理SQL的数据定义和数据控制元素。 . PL/SQL支持所有SQL数据类型和所有SQL函数,同时支持所有ORACLE对象类型 . PL/SQL块可以被命名和存储在ORACLE服务器中,同时也能被其他的PL/SQL程序或SQL命令调...
SQL> DECLARE 2 l_company_name VARCHAR2; 3 BEGIN 4 l_company_name := 'Oracle Corporation'; 5 END; 6 / l_company_name VARCHAR2; * ERROR at line 2: ORA-06550: line 2, column 21: PLS-00215: String length constraints must be in range (1 .. 32767) ...