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For Oracle: substr(string, start_position [, length ] ) Works like: substr('abcdef', 1) would return 'abcdef' , substr('abcdef', 1, 1) would return 'a', substr('abcdef', 2, 3) would return 'bcd'. For this specific problem you only want the first character in the string hence substr(city,1,1). You can go to https://www.techonthenet.com/oracle/functions/substr.php for more info.
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Weather Observation Station 6
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For Oracle: substr(string, start_position [, length ] ) Works like: substr('abcdef', 1) would return 'abcdef' , substr('abcdef', 1, 1) would return 'a', substr('abcdef', 2, 3) would return 'bcd'. For this specific problem you only want the first character in the string hence substr(city,1,1). You can go to https://www.techonthenet.com/oracle/functions/substr.php for more info.