For example, 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 (...
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...
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...
But what happens if we want to search for a single underscore. In other words we want to make sure that the ‘_’ is to be treated as an underscore and not as a wildcard? This can be resolved in Oracle using the ESCAPE clause. SQL> r 1* select * from names where name like '%...
as a pattern, because it precedes the LIKE operator: SELECT sal FROM emp WHERE 'SM%' LIKE ename Patterns often use special characters that Oracle matches with different characters in the value: * An underscore (_) in the pattern matches exactly one character (as opposed to one by...
_ (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) ...
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 ...
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>col pdescfora50 SQL>SELECTx.ksppinm NAME, y.ksppstvl VALUE, x.KSPPDESC PDESC2FROMSYS.x$ksppi x, SYS.x$ksppcv y3WHEREx.indx=y.indxANDx.ksppinmLIKE'%small_table_threshold%'; NAME VALUE PDESC--- --- ---_small_table_threshold3467thresholdleveloftablesizefordirect reads SQL>...
1. What is SQL optimization? 2. How important is SQL optimization? 3. Which criteria are used to determine the load of an SQL statement? 4. Where can I find information on the executed SQL statements? 5. How do I find the most processing-intensive SQL statements overall?