把AM_B_ENTRY表里的ARCHIVAL_CODE字段，值复制给BA_ARCHIVAL_CODE_160812字段

UPDATE AM_B_ENTRY T SET T.BA_ARCHIVAL_CODE_160812=T.ARCHIVAL_CODE

SELECT BA_ARCHIVAL_CODE_160812 FROM  AM_B_ENTRY   查询这个BA_ARCHIVAL_CODE_160812字段里的值