跟java里的split函数的用法是很相像的,举例如下: The awk function split(s,a,sep) splits a string s into an awk array a using the delimiter sep. set time = 12:34:56set hr = `echo $time | awk '{split($0,a,":" ); print a[1]}'` # = 12set sec = `echo $time | awk '{split
1.COALESCE( value1,value2,... ) The COALESCE function returns the fist not NULL value from the list of values. If all the values in the list are NULL, then it returns NULL. Example: COALESCE(NULL,NULL,5,NULL,4) returns 5: coalesce()函数,在处理空值时,'' 和NULL