Hack attempt? Need some info please..

Hi, so I picked up in Elastic someone is throwing the following at our prod servers :

https://our.server.domain/file.php?Version=ID10T&TerminalId=1978"+and+ordsys.ord_dicom.getmappingxpath((chr(33)||chr(126)||chr(33)||chr(65)||chr(66)||chr(67)||chr(49)||chr(52)||chr(53)||chr(90)||chr(81)||chr(54)||chr(50)||chr(68)||chr(87)||chr(81)||chr(65)||chr(70)||chr(80)||chr(79)||chr(73)||chr(89)||chr(67)||chr(70)||chr(68)||chr(33)||chr(126)||chr(33)),1,1)+and+“1”="1

Can someone please break this down into English for me, so I can understand what they are trying to accomplish.

Thank you

It was an attempt for oracle SQL Injection attacks, take a read upfront here.

@Frey said:
It was an attempt for oracle SQL Injection attacks, take a read upfront here.

Oracle SQL Injection via Web

Thanks Frey, I understand it was a SQL injection attempt, the character stuff I wasn`t sure of, the link you provided def helps, thank you.