Question

我正在写一个像这样的SQL

SELECT uid
  FROM search
 WHERE MATCH(product) AGAINST('football basketball')
   AND status=1
 ORDER BY MATCH(product) AGAINST('football basketball') DESC

我在mysql中运行正常，但我不确定它是否有效。我想知道这个“ MATCH（产品）反对（'足球篮球'）”是否会跑两次？

Answer 1

这可能无需担心：

SELECT uid, MATCH(product) AGAINST('football basketball') as imatch
  FROM search
 WHERE imatch 
  AND status=1
 ORDER BY imatch DESC

Answer 2

如果您不想同时选择匹配项，则需要将别名放在where子句中。但是别名只运行一次并将结果存储在“变量”

中

SELECT uid
FROM search
WHERE MATCH(product) AGAINST('football basketball') as imatch
AND status = 1
ORDER BY imatch DESC

请问sql dilettante，谁能告诉我这个sql是否有效？

2 个答案: