CHARINDEX研究

Question

我有一个列，包含由'/‘分隔的两个级联数据，我只想得到与另一个表的一个列相等的'/’之前的内容，所以我尝试在CHARINDEX中使用SUBSTRING，但是我认为我做错了什么，按照代码。

SELECT TOP 1 * FROM arquivo A, tabela_geral B (NOLOCK), campo_concatenado C (NOLOCK)
WHERE A.primeira_parte = SUBSTRING(C.concatenado, 1, CHARINDEX('/', C.concatenado) -1)
AND B.status = 0
AND B.campo = '13'
AND B.numero NOT IN (6, 78, 79, 80, 81, 82, 83, 91)

Answer 1

您应该处理没有“/”的行

如果您考虑像以前那样的值'/‘

SELECT TOP 1 * FROM arquivo A, tabela_geral B (NOLOCK), campo_concatenado C (NOLOCK)
WHERE A.primeira_parte = COALESCE(SUBSTRING(C.concatenado, 1, NULLIF(CHARINDEX('/', C.concatenado), 0) -1), C.concatenado)
AND B.status = 0
AND B.campo = '13'
AND B.numero NOT IN (6, 78, 79, 80, 81, 82, 83, 91)

如果您考虑像“/”之后的值

SELECT TOP 1 * FROM arquivo A, tabela_geral B (NOLOCK), campo_concatenado C (NOLOCK)
WHERE A.primeira_parte = SUBSTRING(C.concatenado, 1, NULLIF(CHARINDEX('/', C.concatenado), 0) -1)
AND B.status = 0
AND B.campo = '13'
AND B.numero NOT IN (6, 78, 79, 80, 81, 82, 83, 91)

我强烈建议你注意肖恩·兰格的评论

Answer 2

你试过这个吗？

 SELECT TOP 1 * FROM arquivo A, tabela_geral B (NOLOCK), campo_concatenado C (NOLOCK)
  WHERE A.primeira_parte = "%/"
  AND B.status = 0
  AND B.campo = '13'
  AND B.numero NOT IN (6, 78, 79, 80, 81, 82, 83, 91)