mysql添加具有空值的查询

Question

我有mysql查询

SELECT
    ju.ID,
    ju.JENIS_USAHA,
    COALESCE(TOTAL_PEMBERI, 0) AS TOTAL_PEMBERI,
    COALESCE(OUTLET_PEMBERI, 0) AS OUTLET_PEMBERI,
    COALESCE(TOTAL_PENERIMA, 0) AS TOTAL_PENERIMA,
    COALESCE(OUTLET_PENERIMA, 0) AS OUTLET_PENERIMA,
    COALESCE(OUTLET_PEMBERI + OUTLET_PENERIMA, 0) AS SEMUA

问题是，当OUTLET_PEMBERI不为null而OUTLET_PENERIMA为null（反之亦然）时，SEMUA将显示0。如何解决此问题？谢谢

Answer 1

尝试分别在两个词上使用COALESCE：

SELECT
    ju.ID,
    ju.JENIS_USAHA,
    COALESCE(TOTAL_PEMBERI, 0) AS TOTAL_PEMBERI,
    COALESCE(OUTLET_PEMBERI, 0) AS OUTLET_PEMBERI,
    COALESCE(TOTAL_PENERIMA, 0) AS TOTAL_PENERIMA,
    COALESCE(OUTLET_PENERIMA, 0) AS OUTLET_PENERIMA,
    COALESCE(OUTLET_PEMBERI, 0) + COALESCE(OUTLET_PENERIMA, 0) AS SEMUA
FROM ...

如果这不能解决您的问题，并且当合计中的 项为NULL时，您确实想要一个零值，则只需保留代码即可。