mysql - Trouble determining isolation level -

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i creating database of stock income statements. every year on january first, companies update information previous year. companies go public/go bankrupt, added or deleted database. don't believe there conflict between of these transactions, still unsure whether go read committed or repeatable read.

this example of 2 of tables

table: company attributes: ticker(primary key), compname

table: incomestatement attributes: ticker(primary key), revenue, netincome


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