使用SELECT语句更新但在每次更新时重新选择

Question

我正在尝试通过选择最高数字并在其中添加1来更新MySQL中的多行来生成下一行。

UPDATE orders SET delivery_number = (
    SELECT new_number FROM (
        SELECT (
            MAX(delivery_number) + 1
        ) AS new_number FROM order_invoice
    ) AS result
) WHERE delivery_number = 0 AND invoice_number != 0;

上面的查询似乎只有SELECT一次，然后为每次更新使用相同的数字。

如何强制它再次扫描表格以获得每次更新时的最高数字？

Answer 1

Switch-AzureMode AzureResourceManager

$targetServicePlan = Get-AzureResource -Name my-serviceplan -OutputObjectFormat New

New-AzureResource -Name MyTestSite -Location "West Europe" `
    -ResourceGroupName Default-Web-WestEurope `
    -ResourceType 'Microsoft.Web/sites' `
    -PropertyObject @{"name" = "MyTestSite"; "ServerFarmId" = $targetServicePlan.ResourceId } `
    -OutputObjectFormat New