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Explain what means to join same table twice

I was preparing for exam and I have this exercise that I don’t understand I have table of Clients that have ClientID, and also I have table of Transactions that have Foreign Key referenced to Clients,…

Calculate number of rows with having clause

I have 3 tables what I’m trying to achieve is to calculate exact number of rows for two kinds of queries. The first one must count number of accounts which has exactly only one row in accounts_extra …

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