--
-- STRINGS
-- Test various data entry syntaxes.
--
-- SQL92 string continuation syntax
SELECT 'first line'
' - next line'
	' - third line'
	AS "Three lines to one";
         Three lines to one          
-------------------------------------
 first line - next line - third line
(1 row)

-- illegal string continuation syntax
SELECT 'first line'
' - next line' /* this comment is not allowed here */
' - third line'
	AS "Illegal comment within continuation";
ERROR:  parser: parse error at or near "'"
--
-- test conversions between various string types
--
SELECT CAST(f1 AS text) AS "text(char)" FROM CHAR_TBL;
 text(char) 
------------
 a   
 ab  
 abcd
 abcd
(4 rows)

SELECT CAST(f1 AS text) AS "text(varchar)" FROM VARCHAR_TBL;
 text(varchar) 
---------------
 a
 ab
 abcd
 abcd
(4 rows)

SELECT CAST(name 'namefield' AS text) AS "text(name)";
 text(name) 
------------
 namefield
(1 row)

SELECT CAST(f1 AS char(10)) AS "char(text)" FROM TEXT_TBL;
 char(text) 
------------
 doh!      
 hi de ho n
(2 rows)

SELECT CAST(f1 AS char(10)) AS "char(varchar)" FROM VARCHAR_TBL;
 char(varchar) 
---------------
 a         
 ab        
 abcd      
 abcd      
(4 rows)

SELECT CAST(name 'namefield' AS char(10)) AS "char(name)";
 char(name) 
------------
 namefield 
(1 row)

SELECT CAST(f1 AS varchar) AS "varchar(text)" FROM TEXT_TBL;
   varchar(text)   
-------------------
 doh!
 hi de ho neighbor
(2 rows)

SELECT CAST(f1 AS varchar) AS "varchar(char)" FROM CHAR_TBL;
 varchar(char) 
---------------
 a   
 ab  
 abcd
 abcd
(4 rows)

SELECT CAST(name 'namefield' AS varchar) AS "varchar(name)";
 varchar(name) 
---------------
 namefield
(1 row)

--
-- test SQL92 string functions
--
SELECT TRIM(BOTH FROM '  bunch o blanks  ') AS "bunch o blanks";
 bunch o blanks 
----------------
 bunch o blanks
(1 row)

SELECT TRIM(LEADING FROM '  bunch o blanks  ') AS "bunch o blanks  ";
 bunch o blanks   
------------------
 bunch o blanks  
(1 row)

SELECT TRIM(TRAILING FROM '  bunch o blanks  ') AS "  bunch o blanks";
   bunch o blanks 
------------------
   bunch o blanks
(1 row)

SELECT TRIM(BOTH 'x' FROM 'xxxxxsome Xsxxxxx') AS "some Xs";
 some Xs 
---------
 some Xs
(1 row)

SELECT SUBSTRING('1234567890' FROM 3) AS "34567890";
 34567890 
----------
 34567890
(1 row)

SELECT SUBSTRING('1234567890' FROM 4 FOR 3) AS "456";
 456 
-----
 456
(1 row)

SELECT POSITION('4' IN '1234567890') AS "4";
 4 
---
 4
(1 row)

SELECT POSITION(5 IN '1234567890') AS "5";
 5 
---
 5
(1 row)

--
-- test implicit type conversion
--
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 text 'text' || char(10) ' and characters' AS "Concat text to char";
 Concat text to char 
---------------------
 text and chara
(1 row)

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