SQL左连接表有双和记录

Question

如果匹配日期，我有两张桌子（dw和点击）并使用foreach加入它。 两个表都有日期2016-06-01（dw表有1条记录，点击表有2条记录）。我想在{0}表格中#include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <semaphore.h> typedef int buffer_item; #define BUFFER_SIZE 5 #define TRUE 1 buffer_item START_NUMBER; buffer_item item; int counter; int insert_item(buffer_item item); int remove_item(buffer_item *item); buffer_item buffer[BUFFER_SIZE]; void* producer(void *ptr); void* consumer(void *ptr); pthread_cond_t condc, condp; pthread_mutex_t mutex; int sleepTime, producerThreads, consumerThreads, a, item; pthread_attr_t attr; sem_t full, empty; int insert_item(buffer_item item) { if(counter < BUFFER_SIZE) { buffer[counter] = item; counter++; return 0; } else { return -1; } } int remove_item(buffer_item *item) { if(counter > 0) { *item = buffer[(counter-1)]; printf("consumer%u consumed %d\n", (unsigned int)pthread_self(),buffer[counter-1]); counter--; return 0; } else { return -1; } } void* producer(void *ptr) { while(TRUE) { sleep(sleepTime); sem_wait(&empty); pthread_mutex_lock(&mutex); if(insert_item(START_NUMBER)) { fprintf(stderr, "error \n"); } else { printf("producer%u produced %d\n", (unsigned int)pthread_self(),START_NUMBER); START_NUMBER++; } pthread_mutex_unlock(&mutex); sem_post(&full); } } void* consumer(void *ptr) { while(TRUE) { sleep(sleepTime); sem_wait(&full); pthread_mutex_lock(&mutex); if(remove_item(&item)) { fprintf(stderr, "error \n"); } else { // printf("consumer%u consumed %d\n", (unsigned int)pthread_self(),&START_NUMBER); } pthread_mutex_unlock(&mutex); sem_post(&empty); } } void initializeData() { pthread_mutex_init(&mutex, NULL); sem_init(&full, 0, 0); sem_init(&empty, 0, BUFFER_SIZE); pthread_attr_init(&attr); counter = 0; } int main(int argc, char **argv) { sleepTime = atoi(argv[1]); producerThreads = atoi(argv[2]); consumerThreads = atoi(argv[3]); START_NUMBER = atoi(argv[4]); item = START_NUMBER; initializeData(); pthread_t pro, con; pthread_mutex_init(&mutex, NULL); pthread_cond_init(&condc, NULL); pthread_cond_init(&condp, NULL); for(a=0; a< consumerThreads;a++) pthread_create(&con, NULL, consumer, NULL); for(a=0;a<producerThreads;a++) pthread_create(&pro, NULL, producer, NULL); pthread_join(con, NULL); pthread_join(pro, NULL); pthread_mutex_destroy(&mutex); pthread_cond_destroy(&condc); pthread_cond_destroy(&condp); sleep(sleepTime); } 列winloss，但由于点击表有2条记录，日期为2016-06-01，并导致winloss双和。但我只想在dw表中总结winloss。有什么建议吗？请参考下图。

Answer 1

您可以使用临时表或公用表表达式执行此操作。这是一个临时的。

If object_id('tempdb..#temp') is not null drop table #temp


select
sum(winloss) as winloss,
updated
--add any other columns you want
into #temp
group by
updated
--add other columns to group


select
t.updated,
t.winloss,
c.*
from #temp t
left join click on c.trandate = t.updated

Answer 2

试试这个：

SELECT * 
FROM DW D
INNER JOIN CLICK C
ON C.CLICKED = D.CLICKCOUNT
AND C.TRANDATE = D.UPDATED

Answer 3

试试这个

SELECT  dw.[updated]
  ,sum(distinct [winloss])
from dw,Click
where dw.updated = Click.trandate 
FROM dw, Click
group by dw.updated