mysql – 在SELECT中重用别名

我想要做的是添加另一个计算的列(cr – dr)

看到你不能在SELECT子句中重用别名,你会怎么去计算总计

    SELECT SUM(b.bet_win * cy.fx_rate )as dr,SUM(b.bet_loss * cy.fx_rate ) as cr,cr+dr as total
    FROM ....
    WHERE ....

SELECT dr,cr,cr + dr as total 
FROM (
    SELECT 
         SUM(b.bet_win * cy.fx_rate ) as dr,SUM(b.bet_loss * cy.fx_rate ) as cr
    FROM ....
    WHERE ....) t;

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