drop table ìÞÙ¸æñÕè;
ERROR:  Relation 'ìÞÙ¸æñÕè' does not exist
create table ìÞÙ¸æñÕè (ÈçäÆɱ text, ÄüƳÍñó¤ varchar, ÇâÉß varchar(16));
create index ìÞÙ¸æñÕèindex1 on ìÞÙ¸æñÕè using btree (ÈçäÆɱ);
create index ìÞÙ¸æñÕèindex2 on ìÞÙ¸æñÕè using hash (ÄüƳÍñó¤);
insert into ìÞÙ¸æñÕè values ('çÙæªäÆ', 'ç®ç®ÒïÊÀ', 'Æ¡A01Äî');
insert into ìÞÙ¸æñÕè values ('êûÝßäÆ', 'ØÂäãÈ´ÓîÄüƳ', 'ÄãB10Äã');
insert into ìÞÙ¸æñÕè values ('ó§ã£äÆ', 'Ó¡ÌÀϴǹȴÓîÄüƳ', 'ØíZ01Ħ');
vacuum ìÞÙ¸æñÕè;
select * from ìÞÙ¸æñÕè;
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   
--------+------------------+---------
 çÙæªäÆ | ç®ç®ÒïÊÀ         | Æ¡A01Äî
 êûÝßäÆ | ØÂäãÈ´ÓîÄüƳ     | ÄãB10Äã
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ
(3 rows)

select * from ìÞÙ¸æñÕè where ÇâÉß = 'ØíZ01Ħ';
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   
--------+------------------+---------
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ
(1 row)

select * from ìÞÙ¸æñÕè where ÇâÉß ~* 'Øíz01Ħ';
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   
--------+------------------+---------
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ
(1 row)

select * from ìÞÙ¸æñÕè where ÇâÉß like '_Z01_';
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   
--------+------------------+---------
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ
(1 row)

select * from ìÞÙ¸æñÕè where ÇâÉß like '_Z%';
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   
--------+------------------+---------
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ
(1 row)

select * from ìÞÙ¸æñÕè where ÄüƳÍñó¤ ~ 'ç®ç®Òï[ÙìØ´ÊÀ]';
 ÈçäÆɱ | ÄüƳÍñó¤ |  ÇâÉß   
--------+----------+---------
 çÙæªäÆ | ç®ç®ÒïÊÀ | Æ¡A01Äî
(1 row)

select * from ìÞÙ¸æñÕè where ÄüƳÍñó¤ ~* 'ç®ç®Òï[ÙìØ´ÊÀ]';
 ÈçäÆɱ | ÄüƳÍñó¤ |  ÇâÉß   
--------+----------+---------
 çÙæªäÆ | ç®ç®ÒïÊÀ | Æ¡A01Äî
(1 row)

select *, character_length(ÈçäÆɱ) from ìÞÙ¸æñÕè;
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   | char_length 
--------+------------------+---------+-------------
 çÙæªäÆ | ç®ç®ÒïÊÀ         | Æ¡A01Äî |           3
 êûÝßäÆ | ØÂäãÈ´ÓîÄüƳ     | ÄãB10Äã |           3
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ |           3
(3 rows)

select *, octet_length(ÈçäÆɱ) from ìÞÙ¸æñÕè;
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   | octet_length 
--------+------------------+---------+--------------
 çÙæªäÆ | ç®ç®ÒïÊÀ         | Æ¡A01Äî |            6
 êûÝßäÆ | ØÂäãÈ´ÓîÄüƳ     | ÄãB10Äã |            6
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ |            6
(3 rows)

select *, position('È´Óî' in ÄüƳÍñó¤) from ìÞÙ¸æñÕè;
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   | strpos 
--------+------------------+---------+--------
 çÙæªäÆ | ç®ç®ÒïÊÀ         | Æ¡A01Äî |      0
 êûÝßäÆ | ØÂäãÈ´ÓîÄüƳ     | ÄãB10Äã |      3
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ |      5
(3 rows)

select *, substring(ÄüƳÍñó¤ from 3 for 6 ) from ìÞÙ¸æñÕè;
 ÈçäÆɱ |     ÄüƳÍñó¤     |  ÇâÉß   |    substr    
--------+------------------+---------+--------------
 çÙæªäÆ | ç®ç®ÒïÊÀ         | Æ¡A01Äî | ÒïÊÀ
 êûÝßäÆ | ØÂäãÈ´ÓîÄüƳ     | ÄãB10Äã | È´ÓîÄüƳ
 ó§ã£äÆ | Ó¡ÌÀϴǹȴÓîÄüƳ | ØíZ01Ħ | ϴǹȴÓîÄüƳ
(3 rows)