这些函数大部分返回VARCHAR2类型的数值.字符函数的返回类型所受的限制和基本数据库类型所受的限制是相同的,比如: VARCHAR2数值被限制为2000字符(ORACLE 8中为4000字符),而CHAR数值被限制为255字符(在ORACLE8中是2000).当在过程性语句中使用时,它们可以被赋值给VARCHAR2或者CHAR类型的PL/SQL变量....
When you create a procedure or function, you may define parameters. There are three types of parameters that can be declared: IN - The parameter can be referenced by the procedure or function. The value of the parameter can not be overwritten by the procedure or function. OUT - The paramet...
RATIO_TO_REPORT :该函数计算expression/(sum(expression))的值,它给出相对于总数的百分比 REGR_ (Linear Regression) Functions :这些线性回归函数适合最小二乘法回归线,有9个不同的回归函数可使用 代码语言:javascript 代码运行次数:0 运行 AI代码解释 四.行比较分析函数 LAG :可以访问结果集中的其它行而不用进...
PASSING Clause for SQL Functions and Conditions Comparison and Sorting of JSON Data Type Values SQL/JSON Path Expression Item Methods See Also: JSON_TRANSFORM in Oracle Database SQL Language Reference CASE Expressionsin Oracle Database SQL Language Reference Parent topic: Insert, Update, and Load...
Home page for Oracle's Analytical SQL capabilities accessible in SQL. Oracle continues to expand its set of statistical functions available in Oracle 12c Database for use far beyond basic querying, supporting a wide range of features and functions: rank
Oracle/PLSQL Built-In Functions ,Oracle/PLSQLBuilt-InFunctions今天发现的一个很不错的网站,对常见函数有个很好的讲解,本来还想自己整理一下,学了这么长时间都没有系统的整理过,看了这个确实不错,值得一看。有不少例子,虽然有些确实很简单,没有必要举例,但是也
Oracle University: Introduction to SQL Oracle University: SQL Workshop I Oracle University: SQL Workshop II YouTube channel: The Magic of SQL Related Analytical SQL Big Data SQL PL/SQL Query Optimization Statistical Functions Connect with Us OTN SQL Community MOSC SQL Language MOSC...
Oracle 11g PL/SQL Function Result Cache(原创) The PL/SQL Function Result Cache The PL/SQL function result cache uses the same infrastructure as the SQL query result cache, and caches the results of the PL/SQL functions in the result cache component of the SGA. Ideal candidates for caching ...
Table 2-17 Character Functions in Oracle and Microsoft SQL Server Microsoft SQL ServerOracleDescription ascii(char) ascii(char) Returns the ASCII equivalent of the character. char(integer_expression) chr(integer_expression) Converts the decimal code for an ASCII character to the corresponding character...
这就是为什么这些函数叫聚合函数(aggregate functions)了--group by all语法解析:--如果使用ALL关键字,那么查询结果将包括由GROUPBY子句产生的所有组,即使某些组没有符合搜索条件的行。--没有ALL关键字,包含GROUPBY子句的SELECT语句将不显示没有符合条件的行的组。