drop table �t�Ӹ��;
create table �t�Ӹ�� (��~�O text, ���q���Y varchar, �a�} varchar(16));
create index �t�Ӹ��index1 on �t�Ӹ�� using btree (��~�O);
create index �t�Ӹ��index2 on �t�Ӹ�� using hash (���q���Y);
insert into �t�Ӹ�� values ('�q���~', '�F�F���', '�_A01��');
insert into �t�Ӹ�� values ('�s�y�~', '�]���������q', '��B10��');
insert into �t�Ӹ�� values ('�\���~', '�����ѥ��������q', '��Z01�E');
vacuum �t�Ӹ��;
select * from �t�Ӹ��;
 ��~�O |     ���q���Y     |  �a�}   
--------+------------------+---------
 �q���~ | �F�F���         | �_A01��
 �s�y�~ | �]���������q     | ��B10��
 �\���~ | �����ѥ��������q | ��Z01�E
(3 rows)

select * from �t�Ӹ�� where �a�} = '��Z01�E';
 ��~�O |     ���q���Y     |  �a�}   
--------+------------------+---------
 �\���~ | �����ѥ��������q | ��Z01�E
(1 row)

select * from �t�Ӹ�� where �a�} ~* '��z01�E';
 ��~�O |     ���q���Y     |  �a�}   
--------+------------------+---------
 �\���~ | �����ѥ��������q | ��Z01�E
(1 row)

select * from �t�Ӹ�� where �a�} like '_Z01_';
 ��~�O |     ���q���Y     |  �a�}   
--------+------------------+---------
 �\���~ | �����ѥ��������q | ��Z01�E
(1 row)

select * from �t�Ӹ�� where �a�} like '_Z%';
 ��~�O |     ���q���Y     |  �a�}   
--------+------------------+---------
 �\���~ | �����ѥ��������q | ��Z01�E
(1 row)

select * from �t�Ӹ�� where ���q���Y ~ '�F�F��[�H�O��]';
 ��~�O | ���q���Y |  �a�}   
--------+----------+---------
 �q���~ | �F�F��� | �_A01��
(1 row)

select * from �t�Ӹ�� where ���q���Y ~* '�F�F��[�H�O��]';
 ��~�O | ���q���Y |  �a�}   
--------+----------+---------
 �q���~ | �F�F��� | �_A01��
(1 row)

select *, character_length(��~�O) from �t�Ӹ��;
 ��~�O |     ���q���Y     |  �a�}   | character_length 
--------+------------------+---------+------------------
 �q���~ | �F�F���         | �_A01�� |                3
 �s�y�~ | �]���������q     | ��B10�� |                3
 �\���~ | �����ѥ��������q | ��Z01�E |                3
(3 rows)

select *, octet_length(��~�O) from �t�Ӹ��;
 ��~�O |     ���q���Y     |  �a�}   | octet_length 
--------+------------------+---------+--------------
 �q���~ | �F�F���         | �_A01�� |            6
 �s�y�~ | �]���������q     | ��B10�� |            6
 �\���~ | �����ѥ��������q | ��Z01�E |            6
(3 rows)

select *, position('����' in ���q���Y) from �t�Ӹ��;
 ��~�O |     ���q���Y     |  �a�}   | position 
--------+------------------+---------+----------
 �q���~ | �F�F���         | �_A01�� |        0
 �s�y�~ | �]���������q     | ��B10�� |        3
 �\���~ | �����ѥ��������q | ��Z01�E |        5
(3 rows)

select *, substring(���q���Y from 3 for 6 ) from �t�Ӹ��;
 ��~�O |     ���q���Y     |  �a�}   |  substring   
--------+------------------+---------+--------------
 �q���~ | �F�F���         | �_A01�� | ���
 �s�y�~ | �]���������q     | ��B10�� | �������q
 �\���~ | �����ѥ��������q | ��Z01�E | �ѥ��������q
(3 rows)