转载自:https://my.oschina.net/leejun2005/blog/405305 Scala 作为一门函数式编程语言,对习惯了指令式编程语言的同学来说,会不大习惯,这里除了思维方式之外,还有语法层面的,比如 underscore(下划线)就会出现在多种场合,令初学者相当疑惑,今天就来总结下 Scala 中下划线的用法。 这里需要注意的是,以下两种写法实现
_ (underscore) matches any single character. The LIKE operator returns true if the expression matches the pattern or false otherwise. The NOT operator negates the LIKE operator: expression NOT LIKE patternCode language: SQL (Structured Query Language) (sql) ...
SELECT last_name FROM customers WHERE last_name LIKE '%er%'; In this Oracle LIKE condition example, we are looking for all customers whose last_name contains the characters 'er'. Example - Using _ wildcard (underscore wildcard) Next, let's explain how the _ wildcard (underscore wildcard...
PL SQL Operator LIKE Operator in IF statement Introduction The LIKE operator compares a character, string, or CLOB value to a pattern. It returns TRUE if the value matches the pattern and FALSE if it does not. The pattern can include the two wildcard characters underscore (_) and perce...
Two wildcard characters are defined for use with LIKE, the percent sign (%) and the underscore (_). '%' matches any number of characters in a string. '/' matches exactly one. For example, the pattern 'New %' will match 'New Car', 'New Bycle', 'New Horse'. ...
修改C:\oracle\product\11.2.0\dbhome\sqlplus\admin\glogin.sql 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SETSQLPROMPT"_USER'@'_CONNECT_IDENTIFIER> "setserveroutput on--显示当前时间settime on--显示语句执行时间settiming on--DEFINE_EDITOR=vimsetlinesize140 ...
SQL> r 1* select * from names where name like '%_abc_%' ID NAME --- --- 1 xyzabcxyz 2 xy_abc_yz Both were picked up using the LIKE clause. Now we want to escape the underscore to indicate that this is a valid character in the string we are searching for. 1* SELECT * FROM...
1.1.1 About Oracle External Tables 1.1.2 About the Access Drivers for Oracle Big Data SQL 1.1.3 About Smart Scan for HDFS 1.1.4 About Storage Indexes 1.1.5 About Predicate Push Down 1.1.6 About Oracle Big Data SQL Statistics 1.2 Installation 2 Using Oracle Big Data SQL for Data Access ...
SQL 里ESCAPE的用法 SQL中escape的用法使用ESCAPE关键字定义转义符。 在模式中,当转义符置于通配符之前时,该通配符就解释为普通字符。例如,要搜索在任意位置包含字符串 5% 的字符串: WHERE ColumnA LIKE '%5/%%'ESCAPE'/' 前后两个%作为通配符使用,中间的%经过ESC ...
The Mask field and the Description Mask option are implemented using SQL Like. The patterns that you can choose from are: % the percentage symbol allows you to match any string of any length (including zero length) _ the underscore symbol allows you to match a single character The reverse...