Submitted on: 16 August 1999.
Revised on: 03 October 1999.
Accepted on: 04 November 1999.
___________________ACM TRANSACTIONS ON DATABASE SYSTEMS
http://reply.papertrans.cn/1/2/135/135-32.png
Submitted on: 01 January 2025.
Revised on: 22 January 2025.
Accepted on: 17 March 2025.
___________________ACM TRANSACTIONS ON DATABASE SYSTEMS
Submitted on: 18 June 2023.
Revised on: 27 September 2023.
Accepted on: 27 October 2023.
___________________ACM TRANSACTIONS ON DATABASE SYSTEMS
http://reply.papertrans.cn/1/2/135/135-35.png
Submitted on: 22 December 2019.
Revised on: 28 February 2020.
Accepted on: 18 March 2020.
___________________ACM TRANSACTIONS ON DATABASE SYSTEMS