REGEXP_LIKE 函数的一般语法是: 其中match_parameter 可以包括以下几种: 'c':表示大小写敏感(Case sensitive)。 'i':表示大小写不敏感(Case insensitive)。 'n':允许模式匹配符号 "." 匹配换行符。 'm':将源字符串视为多行,其中 ^ 和 $ 分别匹配每行的开始和结束,而不是整个字符串的开始和结束。 如果...
select h.froomnumber from t_broker_house h where REGEXP_LIKE(froomnumber,'^([a-z0-9A-Z]|-)*$') 字符串’^198[0-9]$’可以匹配‘1980-1989’,如果希望统计出公司那些员工是80年～89年入职的,就可以使用如下的SQL语句: select * fromempe whereregexp_like(to_char( e.hiredate,'yyyy'),'^...
file-nameofpasswordfile(required),password-passwordforSYSwill be promptedifnot specified at command line,entries-maximum numberofdistinctDBA(optional),force-whether to overwrite existingfile(optional),ignorecase-passwords arecase-insensitive(optional),nosysdba-whether to shut out theSYSDBAlogon(optional Data...
Use uppercase and lowercase to improve the readability of your code (PL/SQL is case-insensitive). As a guideline, use uppercase for reserved words and lowercase for everything else. Avoid deeply nested IF-THEN-ELSE condition control. Use IF-THEN-ELSIF instead. Example of Bad Style IF ......
"Text minimum". Returns (in decimal output) the smallest number of characters possible. This element is case-insensitive. The default is TM9, which returns the number in fixed notation unless the output exceeds 64 characters. If output exceeds 64 characters, then Oracle automatically returns the...
We've already seen the most common workaround – converting all the characters to a standard case. You can also do case-insensitive comparisons usingregexp_like. But what if you want this to happen transparently, like with column-level collation? Or need accent-insensitive searches?
后来看到关于Oracle口令文件相关资料的时候才豁然开朗:数据库认证信息并不一定存在数据库中的,这点和SQL Server很是不一样。在Oracle中有两类特殊的权限SYSDBA和SYSOPER,当DBA需要对数据库进行维护管理操作的时候必须具有这两类特殊权限之中的一种。在数据库没有打开的时候,使用数据库内建的账号是无法登陆数据库的,...
直方图是一种按数据出现的频率来进行分类存储的方法.在oracle中直方图是用来描述表中列数据的分布情况.每一个sql在被执行前都要经过优化这一步骤那么在优化器给出一个最优执行计划之优化器应该要知道sql语句中所引用的底层对象的详细信息. 直方图描述的对象包括列中不同值的数量和它们出现的频率.现在存储每一个不同...
For MS SQL Server it will look like this: dbi:ODBC:driver=msodbcsql18;server=mydb.database.windows.net;database=testdb;TrustServerCertificate=yes ORACLE_USER et ORACLE_PWD These two directives are used to define the user and password for the Oracle database connection. Note that if you ...
The key feature of this kit is a framework that implements best practices for globalization for Java and PL/SQL developers. Oracle Database 10g also added support for case- and accent-insensitive queries and sorts. You can use this feature if you want to use only base letters or base ...