MySQL loop structure

1. Loop structure type
while, loop, repeat

2. Loop control
iterate is similar to continue
leave and break

Three, grammar

1. while
   [label:] while loop condition do
   loop body
   end while [label];

2. loop
   [label:] loop
   loop body
   end loop [label];

3. repeat
   [label:] repeat
   loop body
   until conditions for ending the loop
   end repeat [label];

Label is optional