oracle中使用concatconcat只能连接两个字符,而“||”可以连接多个字符。 如下 用concat时: ①.sql>select concat('aa','bb') from test; concat('aa','bb') --- aabb ②.sql>select concat('aa','bb','cc') from test; 0RA-00909:invalid number of arguments 因此,用concat连接多个字符时,需要嵌套...
concat('aa','bb') --- aabb ②.sql>select concat('aa','bb','cc') from test; 0RA-00909:invalid number of arguments 因此,用concat连接多个字符时,需要嵌套 sql>select concat(concat('aa','bb'),'cc') from test; concat(concat('aa','bb'),'cc') --- aabbcc 用||时: sql>select '...
concat('aa','bb') aabb 1. 2. 3. ②.拼接多个字符串 sql>select concat('aa','bb','cc') from test; 0RA-00909:invalid number of arguments 1. 2. 因此,用concat连接多个字符时,需要嵌套 sql>select concat(concat('aa','bb'),'cc') from test; concat(concat('aa','bb'),'cc') aabbcc...
SQL>selectconcat('CSDN','_yeeXun','china')fromdual; selectconcat('CSDN','_yeeXun','china')fromdual ORA-00909: invalid numberofarguments SQL>select'CSDN'||'_yeeXun'||'china'fromdual; 'CSDN'||'_YEEXUN'||'CHINA' --- CSDN_yeeXunchina...
如下 ⽤concat时: ①.sql>select concat('aa','bb') from test; concat('aa','bb') ---aabb ②.sql>select concat('aa','bb','cc') from test; 0RA-00909:invalid number of arguments 因此,⽤concat连接多个字符时,需要嵌套 sql>select concat(concat('aa','bb'),'cc') from test; concat...
concat('aa','bb') --结果: aabb 1. 2. 3. 4. 5. 6. 多个字符串拼接 AI检测代码解析 select concat('aa','bb','cc') from test; --报错: 0RA-00909:invalid number of arguments 1. 2. 3. AI检测代码解析 因此,用concat连接多个字符时,需要嵌套 ...
然后将控制文件的名称等信息追加到参数文件中: SQL> column ctl_files NEW_VALUE ctl_files; SQL> SELECT CONCAT ('control_files=''', 2 CONCAT (REPLACE (VALUE, ', ', ''','''), ''') 3 ) ctl_files 4 FROM v$parameter WHERE NAME = 'control_files'; CTL_FILES --- control_files='C:...
3.8.2.1 ALL_ARGUMENTS 列出了当前用户可以访问的函数和过程的参数。 名称类型说明 owner varchar2(128) 对象所有者 object_name varchar2(128) 过程或函数名称 package_name varchar2(128) 包名称 object_id number 对象的对象编号 overload varchar2(40) 无效 subprogram_id number 无效 argument_name varchar2(...
2-28 Chapter 2 Changes in R28.0.1 2.19.4 Collecting and Packaging Flight Recording Data from Disk Buffers This release of Oracle JRockit introduces the command-line tool oracle.jrockit.jfr.tools.ConCatRepository, that allows you to extract JRockit Flight Recorder data that has been written to ...
CONCAT function, 4-20 concatenation operator, 3-3 conditions compound, 5-18 EXISTS, 5-18 group comparison, 5-16 in SQL syntax, 5-14 LIKE, 5-18 membership, 5-17 NULL, 5-18 range, 5-18 simple comparison, 5-16 CONNECT BY clause of SELECT, 5-21, 7-577 CONNECT...