use Underline in wild card charecter of Like query gives wrong result

●Question

Why the SQL execution always return the wrong result when i use 'underline' ?

select  * 

from  user

where  userid like 'Karen_Chang%'  

●Solution

Use brackets! []

select  * 

from  user

where  userid like 'Karen[_]Chang%'

break label usage in Objective-C and Java

if you have nested for loop or the for loop need to be break in special condition
use 'break label' can satisfy your demand

●Java
myForLoop: {
    for (; ; ;) {
if(someCondition == True)
            break myForLoop;
    }
}

●Objective-C
for (;;)
{
    for (;;)
    {
        break; /* breaks inner loop */
    }
    for (;;)
    {
        goto myForLoop; /* breaks outer loop */
    }
}
myForLoop:;