ORA-00932：解码BLOB

Question

我有一个包含此列的表：LOGO BLOB

并进行选择

 DECODE (pro.holder_hidden,'T', null, com.LOGO) COMPANY_LOGO 

我收到了错误

ORA-00932: inconsistent datatypes: expected CHAR got BLOB
00932. 00000 -  "inconsistent datatypes: expected %s got %s"
*Cause:    
*Action:

Answer 1

它对你有用吗？

case pro.holder_hidden when 'T' then null else com.LOGO end