Question

我有这张桌子：

CREATE TABLE [dbo].[Phrase]
(
    [PhraseId] UNIQUEIDENTIFIER DEFAULT (newid()) NOT NULL,
    [English] NVARCHAR(250) NOT NULL,
    [Romaji] NVARCHAR(MAX) NULL
)

我尝试向English列添加唯一索引但由于存在重复项而失败。我怎样才能找出哪些是重复的？

Answer 1

嵌套查询查找2行或更多行中的public function __construct($name, Filesystem $filesystem, CDNInterface $cdn, GeneratorInterface $pathGenerator, ThumbnailInterface $thumbnail, array $allowedExtensions = array(), array $allowedMimeTypes = array(), ResizerInterface $resizer, MetadataBuilderInterface $metadata = null, Container $container, EntityManager $entityManager) { ... $this->container = $container; $this->ffmpeg = FFMpeg::create([ 'ffmpeg.binaries' => $this->container->getParameter('xmon_ffmpeg.binary'), 'ffprobe.binaries' => $this->container->getParameter('xmon_ffprobe.binary'), 'timeout' => $this->container->getParameter('xmon_ffmpeg.binary_timeout'), 'ffmpeg.threads' => $this->container->getParameter('xmon_ffmpeg.threads_count') ]); $this->ffprobe = FFProbe::create([ 'ffmpeg.binaries' => $this->container->getParameter('xmon_ffmpeg.binary'), 'ffprobe.binaries' => $this->container->getParameter('xmon_ffprobe.binary') ]); ... }值。外部查询返回嵌套查询中具有English值的行。

此处需要嵌套查询，因为您可能希望获得English，如果PhraseId获取重复值，则group by English将丢失。

PhraseId

Answer 2

;With dupes
as
(select *,row_number() over (partition by english order by (select null)) as rownum
from table)
select * from cte where rownum>1

如何使用SQL Server确定哪些行在列中具有重复值？

2 个答案: