Question

我有以下问题：

DELETE FROM [Entry] 
WHERE CompanyId = 1 
  AND EmployeeId IN (3, 4, 6, 7, 14, 17, 20, 21, 22,....100 more) 
  AND Entry_Date = '2016-12-01' 
  AND Entry_Method = 'I'

DELETE FROM [WrongEntry] 
WHERE CompanyId = 1 
  AND EmployeeId IN (4, 7, 14, 17, 20, 21, 22, 24....100 more) 
  AND Entry_Date = '2016-12-01' 
  AND Entry_Method = 'I'

DELETE FROM [Entry] 
WHERE CompanyId = 1 
  AND EmployeeId IN (1, 4, 6, 7, 14, 17, 20, 21, 22,....100 more) 
  AND Entry_Date = '2016-12-02' 
  AND Entry_Method = 'I'

DELETE FROM [WrongEntry] 
WHERE CompanyId = 1 
  AND EmployeeId IN (5, 7, 14, 17, 20, 21, 22, 24....100 more) 
  AND Entry_Date = '2016-12-02' 
  AND Entry_Method = 'I'

就像我在2016年12月1日至2016年12月31日期间的整个月一样。

当我运行这些查询时，需要花费大量时间和时间。同时，在执行这些查询时，表会被锁定一段时间，直到执行完成。

在上述方案中批量删除的最佳方法是什么？还有其他方法吗？如何快速批量删除这些查询？

注意：EmployeeId始终不同

Answer 1

也许使用不平等会做你想要的：

DELETE FROM [Entry]
    WHERE CompanyId=1 AND
          EmployeeId IN (3,4,6,7,14,17,20,21,22,....100 more) AND
          Entry_Date >= '2016-12-01' AND
          Entry_Date < '2017-01-01' AND
          Entry_Method = 'I';

Answer 2

您可以更改查询以查找日期范围而不是特定日期。

试试这个。

DELETE FROM [Entry] WHERE CompanyId=1 AND EmployeeId IN(3,4,6,7,14,17,20,21,22,....100 more) 
AND Entry_Date >= '2016-12-01' AND Entry_Date <= '2016-12-31'
AND Entry_Method = 'I'

DELETE FROM [WrongEntry] WHERE CompanyId=1 AND EmployeeId IN(4,7,14,17,20,21,22,24....100 more) 
AND Entry_Date >= '2016-12-01' AND Entry_Date <= '2016-12-31'
AND Entry_Method = 'I'

请注意，根据您的字段数据类型，您可能需要将字符串转换为查询中的日期。

Answer 3

我的第一个建议是将列表放入临时表或表变量，这是EmployeeId =＆gt; tempEmployees。第二个是应用块删除，这种技术非常有效，你可以避免与锁相关的问题，这里有一个示例：

https://sqlperformance.com/2013/03/io-subsystem/chunk-deletes

简单来说：

SET NOCOUNT ON;

DECLARE @r INT;

SET @r = 1;

WHILE @r > 0
BEGIN
    BEGIN TRANSACTION;

    DELETE TOP (5000) FROM TableToDelete;

    SET @r = @@ROWCOUNT;

    COMMIT TRANSACTION;
END

SQL批量删除查询

3 个答案: