小编Mat*_*ard的帖子

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,你会怎么做计算 total

    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 ....