Question

我正在编写一个SQL查询来处理产品订单（眼镜镜片）。

在数据库中，一个订单可以有多行。每行代表订单中的不同项目。因此，一行将是正确的镜头，我们将为right.optionA，right.optionB等另一行。左镜头也是如此。

在我的查询中，一行是一个镜头，以及随之而来的所有选项。

我的问题是有几个订单有错误。错误是其中一个选项已输入两次，但不可能有两种类型的选项。

我的查询编写时只考虑每个镜头中的一个特定选项（因此每行），因此当发生此错误时（以及其他数量，销售等），它会生成一个额外的行。

我不想更改我的查询以考虑该类型的多个选项，因为它不会发生，所以我不能做SUM与这些行一起的数据和GROUP BY。

所以我的问题是，如何在SQL中说我只想考虑第一行？

现在我的想法是在该选项类型的行上包含一个count（*），当它大于1时它应该做什么，但我不知道是什么。

以下是带有错误的订单的截图。 CompType列表示项目的类型。 CompType 03是错误所在的位置。我们可以看到行有两次，这就是问题所在：

我尽量保持尽可能短的时间，我知道这有点长时间阅读，对不起。

谢谢你，祝你有个愉快的一天。

Answer 1

由于position列，行不相同。最简单的修复方法是MIN(position)或MAX(position)，然后GROUP BY其他列。

MIN()的示例：

SELECT OrdNumb,
       Side,
       MIN(Position),
       Comptype,
       --Rest of cols
FROM YourTable
GROUP BY OrdNumb,
         Side,
         Comptype,
         --Rest of cols

Answer 2

取决于哪个“位置”是正确的。它必须返回多行，因为有多个值，但正如您所说，它们是错误。我要做的是假设如果每个“comptype”有多个“位置”（这似乎是问题）那么为了摆脱其中一个值，只需选择位置列的最小值或最大值并且只按其他类别分组。希望这会有所帮助。

Answer 3

我认为最重要的是清理系统中的数据。但话虽如此，假设您总是希望按位置复制第一个并且有问题的行总是与好行完全重复 - 这应该可以解决问题：

waiting for kafka to be ready
[2017-11-22 20:32:16,203] INFO KafkaConfig values:
        advertised.host.name = null
        advertised.listeners = PLAINTEXT://172.17.0.6:9093
        advertised.port = null
        alter.config.policy.class.name = null
        authorizer.class.name =
        auto.create.topics.enable = true
        auto.leader.rebalance.enable = true
        background.threads = 10
        broker.id = -1
        broker.id.generation.enable = true
        broker.rack = null
        compression.type = producer
        connections.max.idle.ms = 600000
        controlled.shutdown.enable = true
        controlled.shutdown.max.retries = 3
        controlled.shutdown.retry.backoff.ms = 5000
        controller.socket.timeout.ms = 30000
        create.topic.policy.class.name = null
        default.replication.factor = 1
        delete.records.purgatory.purge.interval.requests = 1
        delete.topic.enable = true
        fetch.purgatory.purge.interval.requests = 1000
        group.initial.rebalance.delay.ms = 0
        group.max.session.timeout.ms = 300000
        group.min.session.timeout.ms = 6000
        host.name =
        inter.broker.listener.name = null
        inter.broker.protocol.version = 1.0-IV0
        leader.imbalance.check.interval.seconds = 300
        leader.imbalance.per.broker.percentage = 10
        listener.security.protocol.map = PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL
        listeners = PLAINTEXT://:9092
        log.cleaner.backoff.ms = 15000
        log.cleaner.dedupe.buffer.size = 134217728
        log.cleaner.delete.retention.ms = 86400000
        log.cleaner.enable = true
        log.cleaner.io.buffer.load.factor = 0.9
        log.cleaner.io.buffer.size = 524288
        log.cleaner.io.max.bytes.per.second = 1.7976931348623157E308
        log.cleaner.min.cleanable.ratio = 0.5
        log.cleaner.min.compaction.lag.ms = 0
        log.cleaner.threads = 1
        log.cleanup.policy = [delete]
        log.dir = /tmp/kafka-logs
        log.dirs = /kafka/kafka-logs-b0311aaa4e60
        log.flush.interval.messages = 9223372036854775807
        log.flush.interval.ms = null
        log.flush.offset.checkpoint.interval.ms = 60000
        log.flush.scheduler.interval.ms = 9223372036854775807
        log.flush.start.offset.checkpoint.interval.ms = 60000
        log.index.interval.bytes = 4096
        log.index.size.max.bytes = 10485760
        log.message.format.version = 1.0-IV0
        log.message.timestamp.difference.max.ms = 9223372036854775807
        log.message.timestamp.type = CreateTime
        log.preallocate = false
        log.retention.bytes = -1
        log.retention.check.interval.ms = 300000
        log.retention.hours = 168
        log.retention.minutes = null
        log.retention.ms = null
        log.roll.hours = 168
        log.roll.jitter.hours = 0
        log.roll.jitter.ms = null
        log.roll.ms = null
        log.segment.bytes = 1073741824
        log.segment.delete.delay.ms = 60000
        max.connections.per.ip = 2147483647
        max.connections.per.ip.overrides =
        message.max.bytes = 1000012
        metric.reporters = []
        metrics.num.samples = 2
        metrics.recording.level = INFO
        metrics.sample.window.ms = 30000
        min.insync.replicas = 1
        num.io.threads = 8
        num.network.threads = 3
        num.partitions = 1
        num.recovery.threads.per.data.dir = 1
        num.replica.fetchers = 1
        offset.metadata.max.bytes = 4096
        offsets.commit.required.acks = -1
        offsets.commit.timeout.ms = 5000
        offsets.load.buffer.size = 5242880
        offsets.retention.check.interval.ms = 600000
        offsets.retention.minutes = 1440
        offsets.topic.compression.codec = 0
        offsets.topic.num.partitions = 50
        offsets.topic.replication.factor = 1
        offsets.topic.segment.bytes = 104857600
        port = 9092
        principal.builder.class = null
        producer.purgatory.purge.interval.requests = 1000
        queued.max.request.bytes = -1
        queued.max.requests = 500
        quota.consumer.default = 9223372036854775807
        quota.producer.default = 9223372036854775807
        quota.window.num = 11
        quota.window.size.seconds = 1
        replica.fetch.backoff.ms = 1000
        replica.fetch.max.bytes = 1048576
        replica.fetch.min.bytes = 1
        replica.fetch.response.max.bytes = 10485760
        replica.fetch.wait.max.ms = 500
        replica.high.watermark.checkpoint.interval.ms = 5000
        replica.lag.time.max.ms = 10000
        replica.socket.receive.buffer.bytes = 65536
        replica.socket.timeout.ms = 30000
        replication.quota.window.num = 11
        replication.quota.window.size.seconds = 1
        request.timeout.ms = 30000
        reserved.broker.max.id = 1000
        sasl.enabled.mechanisms = [GSSAPI]
        sasl.kerberos.kinit.cmd = /usr/bin/kinit
        sasl.kerberos.min.time.before.relogin = 60000
        sasl.kerberos.principal.to.local.rules = [DEFAULT]
        sasl.kerberos.service.name = null
        sasl.kerberos.ticket.renew.jitter = 0.05
        sasl.kerberos.ticket.renew.window.factor = 0.8
        sasl.mechanism.inter.broker.protocol = GSSAPI
        security.inter.broker.protocol = PLAINTEXT
        socket.receive.buffer.bytes = 102400
        socket.request.max.bytes = 104857600
        socket.send.buffer.bytes = 102400
        ssl.cipher.suites = null
        ssl.client.auth = none
        ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
        ssl.endpoint.identification.algorithm = null
        ssl.key.password = null
        ssl.keymanager.algorithm = SunX509
        ssl.keystore.location = null
        ssl.keystore.password = null
        ssl.keystore.type = JKS
        ssl.protocol = TLS
        ssl.provider = null
        ssl.secure.random.implementation = null
        ssl.trustmanager.algorithm = PKIX
        ssl.truststore.location = null
        ssl.truststore.password = null
        ssl.truststore.type = JKS
        transaction.abort.timed.out.transaction.cleanup.interval.ms = 60000
        transaction.max.timeout.ms = 900000
        transaction.remove.expired.transaction.cleanup.interval.ms = 3600000
        transaction.state.log.load.buffer.size = 5242880
        transaction.state.log.min.isr = 1
        transaction.state.log.num.partitions = 50
        transaction.state.log.replication.factor = 1
        transaction.state.log.segment.bytes = 104857600
        transactional.id.expiration.ms = 604800000
        unclean.leader.election.enable = false
        zookeeper.connect = zookeeper:2181
        zookeeper.connection.timeout.ms = 6000
        zookeeper.session.timeout.ms = 6000
        zookeeper.set.acl = false
        zookeeper.sync.time.ms = 2000
 (kafka.server.KafkaConfig)
[2017-11-22 20:32:16,278] INFO starting (kafka.server.KafkaServer)
[2017-11-22 20:32:16,279] INFO Connecting to zookeeper on zookeeper:2181 (kafka.server.KafkaServer)
[2017-11-22 20:32:16,291] INFO Starting ZkClient event thread. (org.I0Itec.zkclient.ZkEventThread)
[2017-11-22 20:32:16,296] INFO Client environment:zookeeper.version=3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:host.name=b0311aaa4e60 (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.version=1.8.0_144 (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.vendor=Oracle Corporation (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.home=/opt/jdk1.8.0_144/jre (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.class.path=:/opt/kafka/bin/../libs/aopalliance-repackaged-2.5.0-b32.jar:/opt/kafka/bin/..(org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.io.tmpdir=/tmp (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:java.compiler=<NA> (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:os.name=Linux (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:os.arch=amd64 (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:os.version=4.9.49-moby (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:user.name=root (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:user.home=/root (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,297] INFO Client environment:user.dir=/ (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,298] INFO Initiating client connection, connectString=zookeeper:2181 sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@1534f01b (org.apache.zookeeper.ZooKeeper)
[2017-11-22 20:32:16,309] INFO Opening socket connection to server zookeeper/172.17.0.4:2181. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn)
[2017-11-22 20:32:16,309] INFO Waiting for keeper state SyncConnected (org.I0Itec.zkclient.ZkClient)
[2017-11-22 20:32:16,313] INFO Socket connection established to zookeeper/172.17.0.4:2181, initiating session (org.apache.zookeeper.ClientCnxn)
...
[2017-11-22 20:32:16,952] INFO [ExpirationReaper-1001-topic]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-11-22 20:32:16,956] INFO [ExpirationReaper-1001-Heartbeat]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-11-22 20:32:16,957] INFO [ExpirationReaper-1001-Rebalance]: Starting (kafka.server.DelayedOperationPurgatory$ExpiredOperationReaper)
[2017-11-22 20:32:16,960] INFO Result of znode creation is: OK (kafka.utils.ZKCheckedEphemeral)
[2017-11-22 20:32:16,972] INFO [GroupCoordinator 1001]: Starting up. (kafka.coordinator.group.GroupCoordinator)
[2017-11-22 20:32:16,973] INFO [GroupCoordinator 1001]: Startup complete. (kafka.coordinator.group.GroupCoordinator)
[2017-11-22 20:32:16,978] INFO [GroupMetadataManager brokerId=1001] Removed 0 expired offsets in 5 milliseconds. (kafka.coordinator.group.GroupMetadataManager)
[2017-11-22 20:32:16,988] INFO [ProducerId Manager 1001]: Acquired new producerId block (brokerId:1001,blockStartProducerId:0,blockEndProducerId:999) by writing to Zk with path version 1 (kafka.coordinator.transaction.ProducerIdManager)
[2017-11-22 20:32:17,004] INFO [TransactionCoordinator id=1001] Starting up. (kafka.coordinator.transaction.TransactionCoordinator)
[2017-11-22 20:32:17,005] INFO [Transaction Marker Channel Manager 1001]: Starting (kafka.coordinator.transaction.TransactionMarkerChannelManager)
[2017-11-22 20:32:17,005] INFO [TransactionCoordinator id=1001] Startup complete. (kafka.coordinator.transaction.TransactionCoordinator)
[2017-11-22 20:32:17,039] INFO Creating /brokers/ids/1001 (is it secure? false) (kafka.utils.ZKCheckedEphemeral)
[2017-11-22 20:32:17,043] INFO Result of znode creation is: OK (kafka.utils.ZKCheckedEphemeral)
[2017-11-22 20:32:17,044] INFO Registered broker 1001 at path /brokers/ids/1001 with addresses: EndPoint(172.17.0.6,9093,ListenerName(PLAINTEXT),PLAINTEXT) (kafka.utils.ZkUtils)
[2017-11-22 20:32:17,046] WARN No meta.properties file under dir /kafka/kafka-logs-b0311aaa4e60/meta.properties (kafka.server.BrokerMetadataCheckpoint)
[2017-11-22 20:32:17,064] INFO Kafka version : 1.0.0 (org.apache.kafka.common.utils.AppInfoParser)
[2017-11-22 20:32:17,064] INFO Kafka commitId : aaa7af6d4a11b29d (org.apache.kafka.common.utils.AppInfoParser)
[2017-11-22 20:32:17,065] INFO [KafkaServer id=1001] started (kafka.server.KafkaServer)
[2017-11-22 20:32:17,100] WARN [Controller id=1001, targetBrokerId=1001] Connection to node 1001 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-22 20:32:17,208] WARN [Controller id=1001, targetBrokerId=1001] Connection to node 1001 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-22 20:32:17,308] WARN [Controller id=1001, targetBrokerId=1001] Connection to node 1001 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-22 20:32:17,410] WARN [Controller id=1001, targetBrokerId=1001] Connection to node 1001 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)

SQL - 如何从查询结果中排除一行与另一行相同？

3 个答案: