Oracle字符串拼接单引号

1.首尾单引号为字符串识别标识,不做转译用

2.首尾单引号里面如果出现的单引号，并且有多个,则相连两个单引号转译为一个字符串单引号

3.单引号一定成对出现,否者这个字符串出错,因为字符串不知道哪个单引号负责结束

select to_char('aaa')from dual;--aaa
select '' || to_char('aaa') || ''from dual;--aaa
select '''' || to_char('aaa') || '''' from dual;--'aaa'
select '''''' || to_char('aaa') || '''''' from dual;--''aaa''
select '''''''' || to_char('aaa') || '''''''' from dual;--'''aaa'''
select ' '' ' ||' ' || ' '' ' || to_char('aaa') || ' '' '' ' from dual;-- '   ' aaa ' ' 

 

转载地址： https://blog.youkuaiyun.com/woshimyc/article/details/72519018