sub_string.txt

orale培训教材包括了所有的sql说明和实例

drop table PLSQL101_OLD_ITEM;

CREATE TABLE plsql101_old_item (
     item_id   CHAR(20),
     item_desc CHAR(25)
     )
;

INSERT INTO plsql101_old_item VALUES
     ('LA-101', 'Can, Small');
INSERT INTO plsql101_old_item VALUES
     ('LA-102', 'Can, Large');
INSERT INTO plsql101_old_item VALUES
     ('LA-103', 'Bottle, Small');
INSERT INTO plsql101_old_item VALUES
     ('LA-104', 'Bottle, Large');
INSERT INTO plsql101_old_item VALUES
     ('NY-101', 'Box, Small');
INSERT INTO plsql101_old_item VALUES
     ('NY-102', 'Box, Large');
INSERT INTO plsql101_old_item VALUES
     ('NY-103', 'Shipping Carton, Small');
INSERT INTO plsql101_old_item VALUES
     ('NY-104', 'Shipping Carton, Large');

SELECT SUBSTR(item_id, 1, 2) MFGR_LOCATION,
       SUBSTR(item_id, 4, 3) ITEM_NUMBER,
       item_desc
FROM   plsql101_old_item
;