CodePudding user response:

Obvious is that your filter condition is not satisfied, eventually lead to no matching records,
This is an empty table either

CodePudding user response:

Problem on logic, you first check the database application technology this is there a typo, you to check the problem step by step, first comment out the where to comment out a and you look at which gave an issue,

CodePudding user response:

refer to the second floor Zhao Chen response:

problem on logic, you first check the database application technology this is there a typo, you to check the problem step by step, first comment out the where commented out another which out of the question, and you see

Solve the thank you

CodePudding user response:

reference 1/f, sunny 8 response:

is obviously, your filter conditions are not met, eventually lead to no matching records,
To this is either empty table

Solve the thank you