Gordon Linoff
2020-12-02 21:46:56
该查询：
SELECT *
FROM cctv1_details c1d LEFT JOIN
cctv3_details c3d
ON c1d.CDE_WR = c3d.CDE_WR AND c1d.CDE_dist = c3d.CDE_dist
正在使用SELECT *。这*是两个表中所有列的简写。
显然，两个表中的合并列具有重复的列名；至少，CDE_WR而且CDE_dist-可能还有其他人。通用解决方案是列出所有列：
SELECT c1d.col1, c1d.col2, . . . c3d.colx, c3d.coly
FROM cctv1_details c1d LEFT JOIN
cctv3_details c3d
ON c1d.CDE_WR = c3d.CDE_WR AND c1d.CDE_dist = c3d.CDE_dist;
但是，这通常简称为：
SELECT c1d.*, c3d.colx, c3d.coly
FROM cctv1_details c1d LEFT JOIN
cctv3_details c3d
ON c1d.CDE_WR = c3d.CDE_WR AND c1d.CDE_dist = c3d.CDE_dist;
请注意，我将表别名更改为表名称的合理缩写，使查询更加清晰和易于维护。
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