The graduation thesis needs the number of M&A cases from 20 1 1 to 20 14 in the M&A database of listed companies in China, Tai 'an, China. Please help.

Idcdtc[ logo of listed company ]- 1: it is a listed company; (When this field is "1", the latter two fields will have contents, otherwise there will be no contents) 2: Unlisted companies.

List loc[ listing place ]- 1 = Shenzhen, 2 = Shanghai, a few overseas listed companies have not disclosed it.

Nmdstc [Industry Name of CSRC]-Subject to the Guidelines for Industry Classification of Listed Companies issued by China Securities Regulatory Commission on April 3, 2006.5438+0. The industry names of unlisted companies have not been entered into the database for the time being, and the preliminary judgment is the data before 2004.