sql server - SQL querying data -

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i have data set - names of companies (very long list). task go through list , check if company exist in our databases (db) , retrieve relevant information then. list external, data dirty, e.g. star ltd in list , star in db. run sql query using clause like.

my problem - process slow if query 1 name one. possible automate process going through list? practical ideas?

example:

enter image description here

data excel , compared data in sql.


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