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casting.txt
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================================================================================
Standard cast
================================================================================
SELECT CAST(1 AS TEXT);
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
(cast
(keyword_cast)
(literal)
(keyword_as)
(keyword_text)))))))
================================================================================
Aliased
================================================================================
SELECT CAST(1 AS TEXT) AS fieldname;
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
value: (cast
name: (keyword_cast)
parameter: (literal)
(keyword_as)
(keyword_text))
(keyword_as)
alias: (identifier))))))
================================================================================
Postgres shorthand
================================================================================
SELECT
1::TEXT,
1::INT4;
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
(cast
(literal)
(keyword_text)))
(term
(cast
(literal)
(int
(keyword_int))))))))
================================================================================
Multiple casts
================================================================================
SELECT
CAST ('100' AS INTEGER),
'100'::INTEGER,
'01-OCT-2015'::DATE;
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
value: (cast
name: (keyword_cast)
parameter: (literal)
(keyword_as)
(int
(keyword_int))))
(term
value: (cast
(literal)
(int
(keyword_int))))
(term
value: (cast
(literal)
(keyword_date)))))))
================================================================================
Casts /w precision
================================================================================
SELECT
CAST (100 AS NUMERIC(32)),
100::FLOAT(32),
100::FLOAT8;
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
value: (cast
name: (keyword_cast)
parameter: (literal)
(keyword_as)
(numeric
(keyword_numeric)
precision: (literal))))
(term
value: (cast
(literal)
(float
(keyword_float)
precision: (literal))))
(term
value: (cast
(literal)
(double)))))))
================================================================================
SELECT AS UNSIGNED
================================================================================
SELECT CAST ("1" AS UNSIGNED INTEGER);
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
value: (cast
name: (keyword_cast)
parameter: (literal)
(keyword_as)
(int
(keyword_unsigned)
(keyword_int))))))))
================================================================================
Cast intervals
================================================================================
SELECT '1 day 10 seconds'::INTERVAL, CAST('1 month' AS INTERVAL)
--------------------------------------------------------------------------------
(program
(statement
(select
(keyword_select)
(select_expression
(term
value: (cast
(literal)
(keyword_interval)))
(term
value: (cast
name: (keyword_cast)
parameter: (literal)
(keyword_as)
(keyword_interval)))))))