SQL
AخA
WITH items AS (
SELECT 'E300' as a, 2 as b, 3 as c
UNION SELECT 'E100' as a, 20 as b, 30 as c
UNION SELECT 'E200' as a, 200 as b, 300 as c
)
SELECT CONVERT(SUBSTRING_INDEX(a, 'E', -1), UNSIGNED INTEGER) AS num FROM items
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