Soft open interview

1. 1 minute self-introduction
2. Database knowledge: 1) the difference between stored procedures and functions, advantages stored procedures?
2) the shortcomings index?
3) What is a transaction? What is the lock? What's the difference?
3. Credit card payments (automatically draw money), batch, slow, how to solve?
4. preorder traversal sequence is known, and the binary tree, and seeking a preorder traversal of this tree?
The write method of the exchange of two or more numeric int variables a and b is?
6. Common test methods? The difference between black box and white-box testing?
7. The product manager is doing what?
8. Database Chinese garbled?
9. 1000 bottle of medicine, where a bottle of poison, there are 10 mice, mice one hour after taking poison, ignoring Yao time, asking how to know which toxic bottle of medicine in an hour?
10. What is the precision and recall rate?