oracle trim函数除去空格

官网语法图

TRIM([ { { LEADING | TRAILING | BOTH }
         [ trim_character ]
       | trim_character
       }
       FROM 
     ]
     trim_source
    )

• leading：开头字符
• trailing：结尾字符
• both：开头和结尾字符
• trim_character：去除的字符
• trim_source：修剪源