Teradata 15：解析字符串

Question

The task is to scan a string varchar value, which can be null or 3 to N symbols length, and find out if it contains a specific combination in it.

Example: Find if string A001G002F001H003Z701 contains F001 or B004 or J005

Which solution for this task is the most efficient? thx

Answer 1

You can use either LIKE ANY :

WHERE x LIKE ANY ( '%F001%', '%B004%', '%J005%')

or a RegEx:

WHERE RegExp_Instr(x, 'F001|B004|J005') > 0

Run it against a huge table and compare CPU using Query Log