这个函数的名称在不同 的数据库中不完全一样: MySQL: SUBSTR(), SUBSTRING() Oracle: SUBSTR() 最常用到的方式如下 (在这里我们用SUBSTR()为例): SUBSTR(str,pos): 由<str>中,选出所有从第<pos>位置开始的字符。请注意,这个语法不适 用于SQL Server 上。 SUBSTR(str,pos,len): 由<str>中的第<pos>...
SQL> select substr('abc', 1, 2) from dual; SUBSTR('ABC',1,2) --- ab --右取两个字符 SQL> select substr('abc', -2, 2) from dual; SUBSTR('ABC',-2,2) --- bc
-- MySQL & SQL ServerSELECTFORMAT(123456.789,2);-- '123,456.79' STRING_SPLIT(SQL Server)/SPLIT_STRING(MySQL) - 字符串分割 -- SQL ServerSELECTvalueFROMSTRING_SPLIT('a,b,c',',');-- MySQLSELECTSUBSTRING_INDEX('a,b,c',',',1);-- 'a' GROUP_CONCAT/STRING_AGG - 字符串聚合 -- MySQ...
Now I will discuss another function that can be used along with substring in Oracle SQL. The LOWER function converts an input string to a lowercase. If the string contains characters other than letters then they are not affected by the UPPER function. Syntax LOWER (< string >) Parameters or...
【Oracle】PL/SQL中对空字符串的判断 写在最前面:在Oracle 11g中一个空字符串和零个字符是没有区别的。 今天在使用Oracle编写PL/SQL程序的时候,发现一个问题,我的表中本身不是空字符串,但是在使用if语句判断(字段 <> '')的时候,if语句竟然不会生效,很是纳闷! 后来查询相关资料发现:Oracle建议您不要将空...
Oracle SUBSTR function : The SUBSTR functions returns the specified number (substring_length) of characters from a particular position of a given string.
This chapter provides detailed descriptions of the differences in data types used by Microsoft SQL Server and Oracle databases. Specifically, this chapter contains the following information: A table showing the base Microsoft SQL Server data types available and how they are mapped to Oracle data types...
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 substr function is a function that returns a substring from a string. syntax substr([input],[start],[length]) or substr([input],[start]) or With input the String to take a substring from, start is the starting position where 1 is the first character. (if you pass 0, this wi...
String line = null; boolean result = false; while ((line = bufIn.readLine()) != null) { if (line.contains(ORACLE_SQL)) { result = true; } // 将该行写入内存 tempStream.write(line); // 添加换行符 tempStream.append(System.getProperty("line.separator")); ...