strings.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

SELECT 'i_dio' LIKE 'i$_nd_o' ESCAPE '$' AS "false";
 false 
-------
 f
(1 row)

SELECT 'i_dio' NOT LIKE 'i$_nd_o' ESCAPE '$' AS "true";
 true 
------
 t
(1 row)

SELECT 'i_dio' LIKE 'i$_d%o' ESCAPE '$' AS "true";
 true 
------
 t
(1 row)

SELECT 'i_dio' NOT LIKE 'i$_d%o' ESCAPE '$' AS "false";
 false 
-------
 f
(1 row)

-- escape character same as pattern character
SELECT 'maca' LIKE 'm%aca' ESCAPE '%' AS "true";
 true 
------
 t
(1 row)

SELECT 'maca' NOT LIKE 'm%aca' ESCAPE '%' AS "false";
 false 
-------
 f
(1 row)

SELECT 'ma%a' LIKE 'm%a%%a' ESCAPE '%' AS "true";
 true 
------
 t
(1 row)

SELECT 'ma%a' NOT LIKE 'm%a%%a' ESCAPE '%' AS "false";
 false 
-------
 f
(1 row)

SELECT 'bear' LIKE 'b_ear' ESCAPE '_' AS "true";
 true 
------
 t
(1 row)

SELECT 'bear' NOT LIKE 'b_ear' ESCAPE '_' AS "false";
 false 
-------
 f
(1 row)

SELECT 'be_r' LIKE 'b_e__r' ESCAPE '_' AS "true";
 true 
------
 t
(1 row)

SELECT 'be_r' NOT LIKE 'b_e__r' ESCAPE '_' AS "false";
 false 
-------
 f
(1 row)

SELECT 'be_r' LIKE '__e__r' ESCAPE '_' AS "false";
 false 
-------
 f
(1 row)

SELECT 'be_r' NOT LIKE '__e__r' ESCAPE '_' AS "true";
 true 
------
 t
(1 row)

--
-- test ILIKE (case-insensitive LIKE)
-- Be sure to form every test as an ILIKE/NOT ILIKE pair.
--
SELECT 'hawkeye' ILIKE 'h%' AS "true";
 true 
------
 t
(1 row)

SELECT 'hawkeye' NOT ILIKE 'h%' AS "false";
 false 
-------
 f
(1 row)

SELECT 'hawkeye' ILIKE 'H%' AS "true";
 true 
------
 t
(1 row)

SELECT 'hawkeye' NOT ILIKE 'H%' AS "false";
 false 
-------
 f
(1 row)

SELECT 'hawkeye' ILIKE 'H%Eye' AS "true";
 true 
------
 t
(1 row)

SELECT 'hawkeye' NOT ILIKE 'H%Eye' AS "false";
 false 
-------
 f
(1 row)

SELECT 'Hawkeye' ILIKE 'h%' AS "true";
 true 
------
 t
(1 row)

SELECT 'Hawkeye' NOT ILIKE 'h%' AS "false";
 false 
-------
 f
(1 row)

--
-- test implicit type conversion
--
-- E021-07 character concatenation
SELECT 'unknown' || ' and unknown' AS "Concat unknown types";
 Concat unknown types 
----------------------
 unknown and unknown
(1 row)

SELECT text 'text' || ' and unknown' AS "Concat text to unknown type";
 Concat text to unknown type 
-----------------------------
 text and unknown
(1 row)

SELECT char(20) 'characters' || ' and text' AS "Concat char to unknown type";
 Concat char to unknown type 
-----------------------------
 characters and text
(1 row)

SELECT text 'text' || char(20) ' and characters' AS "Concat text to char";
 Concat text to char 
---------------------
 text and characters
(1 row)

SELECT text 'text' || varchar ' and varchar' AS "Concat text to varchar";
 Concat text to varchar 
------------------------
 text and varchar
(1 row)

--
-- test substr with toasted text values
--
CREATE TABLE toasttest(f1 text);
insert into toasttest values(repeat('1234567890',10000));
insert into toasttest values(repeat('1234567890',10000));
--
-- Ensure that some values are uncompressed, to test the faster substring
-- operation used in that case
--
alter table toasttest alter column f1 set storage external;
insert into toasttest values(repeat('1234567890',10000));
insert into toasttest values(repeat('1234567890',10000));
-- If the starting position is zero or less, then return from the start of the string
-- adjusting the length to be consistent with the "negative start" per SQL92.
SELECT substr(f1, -1, 5) from toasttest;
 substr 
--------
 123
 123
 123
 123
(4 rows)

-- If the length is less than zero, an ERROR is thrown.
SELECT substr(f1, 5, -1) from toasttest;
ERROR:  negative substring length not allowed
-- If no third argument (length) is provided, the length to the end of the
-- string is assumed.
SELECT substr(f1, 99995) from toasttest;
 substr 
--------
 567890
 567890
 567890
 567890
(4 rows)

-- If start plus length is > string length, the result is truncated to
-- string length
SELECT substr(f1, 99995, 10) from toasttest;
 substr 
--------
 567890
 567890
 567890
 567890
(4 rows)

DROP TABLE toasttest;
--
-- test substr with toasted bytea values
--
CREATE TABLE toasttest(f1 bytea);
insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
--
-- Ensure that some values are uncompressed, to test the faster substring
-- operation used in that case
--
alter table toasttest alter column f1 set storage external;
insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
-- If the starting position is zero or less, then return from the start of the string
-- adjusting the length to be consistent with the "negative start" per SQL92.
SELECT substr(f1, -1, 5) from toasttest;
 substr 
--------
 123
 123
 123
 123
(4 rows)

-- If the length is less than zero, an ERROR is thrown.
SELECT substr(f1, 5, -1) from toasttest;
ERROR:  negative substring length not allowed
-- If no third argument (length) is provided, the length to the end of the
-- string is assumed.
SELECT substr(f1, 99995) from toasttest;
 substr 
--------
 567890
 567890
 567890
 567890
(4 rows)

-- If start plus length is > string length, the result is truncated to
-- string length
SELECT substr(f1, 99995, 10) from toasttest;
 substr 
--------
 567890
 567890
 567890
 567890
(4 rows)

DROP TABLE toasttest;
--
-- test length
--
SELECT length('abcdef') AS "length_6";
 length_6 
----------
        6
(1 row)

--
-- test strpos
--
SELECT strpos('abcdef', 'cd') AS "pos_3";
 pos_3 
-------
     3
(1 row)

SELECT strpos('abcdef', 'xy') AS "pos_0";
 pos_0 
-------
     0
(1 row)

--
-- test replace
--
SELECT replace('abcdef', 'de', '45') AS "abc45f";
 abc45f 
--------
 abc45f
(1 row)

SELECT replace('yabadabadoo', 'ba', '123') AS "ya123da123doo";
 ya123da123doo 
---------------
 ya123da123doo
(1 row)

SELECT replace('yabadoo', 'bad', '') AS "yaoo";
 yaoo 
------
 yaoo
(1 row)

--
-- test split_part
--
select split_part('joeuser@mydatabase','@',0) AS "an error";
ERROR:  field position must be greater than zero
select split_part('joeuser@mydatabase','@',1) AS "joeuser";
 joeuser 
---------
 joeuser
(1 row)

select split_part('joeuser@mydatabase','@',2) AS "mydatabase";
 mydatabase 
------------
 mydatabase
(1 row)

select split_part('joeuser@mydatabase','@',3) AS "empty string";
 empty string 
--------------
 
(1 row)

select split_part('@joeuser@mydatabase@','@',2) AS "joeuser";
 joeuser 
---------
 joeuser
(1 row)

--
-- test to_hex
--
select to_hex(256*256*256 - 1) AS "ffffff";
 ffffff 
--------
 ffffff
(1 row)

select to_hex(256::bigint*256::bigint*256::bigint*256::bigint - 1) AS "ffffffff";
 ffffffff 
----------
 ffffffff
(1 row)

--
-- MD5 test suite - from IETF RFC 1321
-- (see: ftp://ftp.rfc-editor.org/in-notes/rfc1321.txt)
--
select md5('') = 'd41d8cd98f00b204e9800998ecf8427e' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('a') = '0cc175b9c0f1b6a831c399e269772661' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('abc') = '900150983cd24fb0d6963f7d28e17f72' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('message digest') = 'f96b697d7cb7938d525a2f31aaf161d0' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('abcdefghijklmnopqrstuvwxyz') = 'c3fcd3d76192e4007dfb496cca67e13b' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789') = 'd174ab98d277d9f5a5611c2c9f419d9f' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('12345678901234567890123456789012345678901234567890123456789012345678901234567890') = '57edf4a22be3c955ac49da2e2107b67a' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5(''::bytea) = 'd41d8cd98f00b204e9800998ecf8427e' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('a'::bytea) = '0cc175b9c0f1b6a831c399e269772661' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('abc'::bytea) = '900150983cd24fb0d6963f7d28e17f72' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('message digest'::bytea) = 'f96b697d7cb7938d525a2f31aaf161d0' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('abcdefghijklmnopqrstuvwxyz'::bytea) = 'c3fcd3d76192e4007dfb496cca67e13b' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'::bytea) = 'd174ab98d277d9f5a5611c2c9f419d9f' AS "TRUE";
 TRUE 
------
 t
(1 row)

select md5('12345678901234567890123456789012345678901234567890123456789012345678901234567890'::bytea) = '57edf4a22be3c955ac49da2e2107b67a' AS "TRUE";
 TRUE 
------
 t
(1 row)