Question

我想将MySQL查询转换为T-SQL，我需要日期格式功能，这是我在MySQL中的查询：

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN ('241') 
AND DATE_FORMAT(t.period,"%Y-%m") = '2017-09'

我收到错误，'DATE_FORMAT' is not a recognized built-in function name，任何人都可以帮我解决此问题。

Answer 1

在两个数据库中，最好使用显式日期比较来编写它：

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target t LEFT JOIN
     tb_keyindicator k
     ON k.id = t.keyindicator_id 
WHERE t.branch_id IN ('241') AND
      t.period >= '2017-09-01' AND
      t.period < '2017-10-01';

请注意，如果branch_id是一个数字，那么您应该删除单引号以进行比较。

通过使用直接日期比较，SQL引擎可以利用列上的适当索引。

Answer 2

如果您愿意，可以将日期转换为yyyy-mm格式，

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN ('241') 
AND CONVERT(char(7), t.period, 121) = '2017-09'

Answer 3

如果您想按月过滤：

SELECT t.id, 
       t.value, 
       t.branch_id, 
       k.name 
FROM tb_target t LEFT JOIN
tb_keyindicator k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN ('241') AND
      datepart(month, t.period) = 9

Answer 4

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN ('241') 
AND LEFT(CONVERT(varchar, t.period,112),6) = '2017-09'

如何在sql server中搜索月份和年份

4 个答案: