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INSTR(Ô´×Ö·û´®, Ä¿±ê×Ö·û´®, ÆðʼλÖÃ, Æ¥ÅäÐòºÅ)
ÀýÈ磺INSTR('CORPORATE FLOOR','OR', 3, 2)ÖУ¬Ô´×Ö·û´®Îª'CORPORATE FLOOR', Ä¿±ê×Ö·û´®Îª'OR'£¬ÆðʼλÖÃΪ3£¬È¡µÚ2¸öÆ¥ÅäÏîµÄλÖá£
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ËùÒÔSELECT INSTR('CORPORATE FLOOR', 'OR', -1, 1) "Instring" from DUALµÄÏÔʾ½á¹ûÊÇ
Instring
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È¡µÃ×Ö·û´®ÖÐÖ¸¶¨ÆðʼλÖúͳ¤¶ÈµÄ×Ö·û´®   substr( string, start_position, [ length ] )
Èç:
     substr('This is a test', 6, 2)     would return 'is'
     substr('This is a test', 6)     would return 'is a test'
     substr('TechOnTheNet', -3, 3)     would return 'Net'
     substr('TechOnTheNet', -6, 3)     would return 'The'select substr('Thisisatest', -4, 2) value from dual


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