PHP只检索一列的值 [英] PHP retrieve the values of only one column
问题描述
我想只检索mysql中一列的值，并使用这些值绘制图形。我知道如何回应这些价值观。但是，我无法单独写出来。假设我有一张叫做汽车的桌子。它有一个用于汽车vin的列和一个用于品牌的列和一个用于价格的列。我只想检索价格列，并使用这些数字绘制条形图。
因此，X轴显示条形1,2,3 ......条形长度显示价格。我知道如何绘图，但我无法从该列中检索数字。请帮助。
I want to only retrieve the values of one column in mysql and use these values to plot a graph. I know how to echo these values. However, I am unable to write them seperately. Let''s say I have a table called cars. It has a column for car vin and a column for brand and a column for price. I just want to retrieve the column for the price and use these numbers to plot a bar graph.
So the X-axis shows bar 1, 2, 3 ... and the bar length shows the price. I know how to graph but I cannot retrieve the numbers from that column. Please help.
推荐答案
您好。
MySQL只返回您放入SELECT语句的那些列。除非你使用外卡字符（*），否则它将返回所有字符。
例如：
Hi.
MySQL will only return those columns you put into the SELECT statement. Unless you use the wild card character (*), in which case it will return all of them.
For example:
谢谢Ati
我按照你的意思显示或回显结果：
第1行：15行2 ：18Row 3：26Row 4:14Row 5:54Row 6:31
但是，我想在另一个数组中使用这些值。我该如何检索它们。
我的数组是这样的：
Thanks Ati
I got it working to display or echo the results as you see:
Row 1: 15Row 2: 18Row 3: 26Row 4: 14Row 5: 54Row 6: 31
However, I want to use these values in another array. How do I retrieve them.
my array is like this:
data =（1 => somenumber1，somenumber2，somenumber3 ....） ;
somenumber实际上是一个数字。我只是写了一些数字
如何更换这些somenumbers？我回应的那一列的值。
像somenumber1应该是第1行的值
和somenumber2应该是第2行的值
请记住：我想在while循环之外使用这些值。
感谢您的帮助。
data=(1=> somenumber1, somenumber2, somenumber3 ....);
somenumber is really a number. I just wrote as somenumber
How do I replace these "somenumbers" with the value of that column that I echoed.
Like somenumber1 should be the value of Row 1
and somenumber2 should be the value of Row 2
Remember: I want to use these values outside the while loop.
Thanks for your help.
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