Definitions for "Substr"
A string function. SUBSTR(column, start-point, how-many). SELECT SUBSTR(name, 2, 4) FROM employees Would return characters 2, 3, 4, 5 in name
SUBSTR defines the comparison rule of an attribute when used in a search filter which contains wildcards. When the whole string is used the EQUALITY rule is used. Attribute definition.
Keywords:  extract
Extract substring