Question

sql接口不允许我在我的SQL查询中加分号。我该怎么做才能绕过这个？

import numpy as np
import theano
import theano.tensor as T
from theano.tensor.nnet import conv2d

# original image
img = [[[1, 2, 3, 4], #R channel
       [1, 1, 1, 1],  #
       [2, 2, 2, 2]], #

      [[1, 1, 1, 1],  #G channel
       [2, 2, 2, 2],  #
       [1, 2, 3, 4]], #

      [[1, 1, 1, 1],  #B channel
       [1, 2, 3, 4],  #
       [2, 2, 2, 2],]]#

# separate and reshape each channel to 4D 
R = np.asarray([[img[0]]], dtype='float32')
G = np.asarray([[img[1]]], dtype='float32')
B = np.asarray([[img[2]]], dtype='float32')       

# 4D kernel from the original : [1,0,1] 
kernel = np.asarray([[[[1],[0],[1]]]], dtype='float32')

# theano convolution
t_img = T.ftensor4("t_img")
t_kernel = T.ftensor4("t_kernel")
result = conv2d(
            input = t_img,
            filters=t_kernel,
            filter_shape=(1,1,1,3),
            border_mode = 'half')
f = theano.function([t_img,t_kernel],result)

# compute each channel
R = f(R,kernel)
G = f(G,kernel)
B = f(B,kernel)

# reshape again
img = np.asarray([R,G,B])
img = np.reshape(img,(3,3,4))
print img

如果我杀了分号，界面会给出：

错误：ORA-00907：缺少右括号。

如果我输入分号，界面会给出：

错误：ORA-00911：无效字符

在我的sqllite程序中，查询在没有select country.country, count(customer.customer_id) as country_count from customer join address on customer.address_id = address.address_id join city on address.city_id = city.city_id join country on city.country_id = country.country_id group by country.country_id order by country_count desc; limit 10的情况下工作正常。

Answer 1

在elif inst ['Events'][0]['Code'] == "instance-stop": if "[Completed]" in inst['Events'][0]['Description']: print "Nothing to do here"之后加分号，分号始终位于查询的 end 。

LIMIT

请注意，这是MySQL语法，因此这个查询引发错误并不奇怪。您应该使用order by country_count desc limit 10;：

rownum

Answer 2

您正在寻找此

SELECT *
FROM   (SELECT country.country,
               Count(customer.customer_id) AS country_count
        FROM   customer
               JOIN address
                 ON customer.address_id = address.address_id
               JOIN city
                 ON address.city_id = city.city_id
               JOIN country
                 ON city.country_id = country.country_id
        GROUP  BY country.country_id
        ORDER  BY country_count DESC)
WHERE  ROWNUM <= 10

在Oracle LIMIT关键字中不支持使用ROWNUM来限制记录

Answer 3

如果您使用的是Oracle 12，则可以使用FETCH FIRST：

     SELECT country.country, COUNT (customer.customer_id) AS country_count
       FROM customer
            JOIN address ON customer.address_id = address.address_id
            JOIN city ON address.city_id = city.city_id
            JOIN country ON city.country_id = country.country_id
   GROUP BY country.country_id
   ORDER BY country_count DESC
FETCH FIRST 10 ROWS ONLY

如果没有，实际上FETCH FIRST就是这样的语法糖：

  SELECT country, country_count
    FROM (  SELECT country.country, 
                   COUNT (customer.customer_id) AS country_count, 
                   ROW_NUMBER () OVER (ORDER BY COUNT (customer.customer_id) DESC) rn
              FROM customer
                   JOIN address ON customer.address_id = address.address_id
                   JOIN city ON address.city_id = city.city_id
                   JOIN country ON city.country_id = country.country_id
          GROUP BY country.country_id)
   WHERE rn <= 10
ORDER BY country_count DESC

您可以在Oracle版本中使用它＆lt; 12

在SQL语句中不能使用分号。我该怎么做？

3 个答案: