Unknown column 'counts' in 'where clause'

This error message typically appears when a SQL query is attempting to filter or manipulate data using a column that does not exist in the specified table or view.

For example, if a query includes a WHERE clause that references a column called "counts" but there is no such column in the table being queried, the database system will return the "unknown column 'counts' in 'where clause'" error message.

To resolve this issue, check your query and make sure that all column names and table/view names are spelled correctly and are valid. If you are using aliases or calculated fields, ensure that they are properly defined and referenced.

相关问题

counts = {} for num in nums: if num in counts: counts[num] += 1 else: counts[num] = 1

这段代码的作用是统计列表 nums 中每个元素出现的次数，并将结果存储在字典 counts 中。如果 num 已经在 counts 中出现过，则将其对应的值加 1，否则将其添加到 counts 中并将其值设为 1。

def distribution1(column): x = shuju[column].value_counts().index y = shuju[column].value_counts().values plt.bar(x,y,width=shuju[column].nunique()*0.2) plt.xlabel(column) plt.figure(figsize=(15,3.5)) shuju = data2[['charging_status','dcdc_stat']] for i in range(0,4): plt.subplot(1,4,i+1) distribution1(shuju.columns[i]) plt.show()

好的，我明白了您的要求。关于您的问题，这段代码是用于绘制一个数据集中特定字段的取值分布图，其中包含两个字段：charging_status和dcdc_stat。数据集为data2。具体实现过程是，首先定义了一个函数distribution1用于绘制柱状图，并传入参数column表示当前要绘制的字段名。然后使用shuju[column].value_counts()获取该字段取值的数量分布情况，将取值保存到x和数量保存到y中，并使用plt.bar(x,y)绘制柱状图，其中柱子的宽度为该字段取值的个数乘以0.2。最后，使用plt.xlabel(column)设置柱状图的横坐标标签，使用plt.figure(figsize=(15,3.5))设置整个图的大小，并通过循环调用distribution1函数，绘制多个柱状图，最终显示整个图像。