So I have 3 tables,
所以我有3张桌子,
Companies (company_id, company_name)
Stock_Exchanges(stock_exchange_id, stock_exchange_name, stock_exchange_manager)
Stock_Exchanges_Companies(stock_exchange_id, company_id)
Companies (c
阅读背景：
SQL如何在哪里使用！=有效的东西？
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