Question

我有以下SQL查询：

SELECT Date AS timestamps, Seasons1 AS seasons_1, Seasons2 AS seasons_2,
    Seasons3 AS seasons_3, Seasons4 AS seasons_4, Seasons5 AS seasons_5,
    Seasons6 AS seasons_6, Seasons7 AS seasons_7
FROM SeasonsTable WITH(NOLOCK)
ORDER BY timestamps DESC

有没有办法返回包含所有seasons作为数组的单列（称为seasons_*）？

例如，当前返回：

timestamps seasons_1 ... seasons_7
2019-04-28 1.0  2.0  3.0  4.0  5.0  6.0  7.0

但我希望它返回：

timestamps seasons
2019-04-28 [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0]

Answer 1

select Date as timestamps, '[' + cast(Seasons1 as nvarchar) + ',' + cast(Seasons2 as nvarchar) + ... + ']' as seasons

Answer 2

如评论中所述，TSQL没有数组。要将数据作为定界字符串返回，只需连接列：

SELECT Date AS timestamps, Seasons1 + ',' + Seasons2 + ',' + Seasons3 + ',' + Seasons4 + ',' + Seasons5 + ',' +  Seasons6 + ',' + Seasons7 AS season
FROM SeasonsTable WITH(NOLOCK)
ORDER BY timestamps DESC

取决于季节列的数据类型，您可能需要使用cast（seasonsX作为varchar），而不仅仅是列名。

将SQL查询的列分组为数组

2 个答案: