I haven't been on this website for a long time. Recently, there is a technical issue to discuss, so I came up to look for information.
I found that the content discussed above on csdn has also changed a lot, and found that I can't keep up with it. It seems that I will have to observe and learn for a long time in the future.
In the past two or three years, I have done a period of sales and technical support, which can be said to be engineering. I have also accumulated some on-site engineering experience. Ha ha, it can only be said that the development of this piece may be almost forgotten. Up.
I took a rest today and took a look at some of the grammar about sql posted by the masters, which happens to be my weakness. Learned a lot. Here, thank them! ! !