SnowConvert: Redshift 함수¶

 SELECT '     abc    ' AS untrim, btrim('     abc    ') AS trim;

SELECT 'setuphistorycassettes' AS untrim, btrim('setuphistorycassettes', 'tes') AS trim;

 SELECT '     abc    ' AS untrim,
TRIM('     abc    ') AS trim;

SELECT 'setuphistorycassettes' AS untrim,
TRIM('setuphistorycassettes', 'tes') AS trim;

 CONCAT ( expression1, expression2 )

 SELECT LEFT('Chicago', 3) AS left_3, RIGHT('Chicago', 3) AS right_3;

 SELECT LEFT('Chicago', 3) AS left_3, RIGHT('Chicago', 3) AS right_3;

 LOWER ( string )

 SELECT 
    QUOTE_IDENT('"CAT"'),
    "QUOTE_IDENT"('Foo bar') ;

 SELECT
    CONCAT('"', REPLACE('"CAT"', '"', '""'), '"'),
    CONCAT('"', REPLACE('Foo bar', '"', '""'), '"');

 REGEXP_REPLACE( source_string, pattern [, replace_string [ , position [, parameters ] ] ] )

 REPLACE(string, old_chars, new_chars)

 SELECT REPLACE('Hello World', ' ', '_') AS modified_string,
       REPLACE('Apple, Orange, Banana, Grape', ',', '') AS fruits,
       REPLACE('http://example.com/path/to/resource', '/path/to', '/new-path') AS updated_url;

 SELECT REPLACE('Hello World', ' ', '_') AS modified_string,
       REPLACE('Apple, Orange, Banana, Grape', ',', '') AS fruits,
       REPLACE('http://example.com/path/to/resource', '/path/to', '/new-path') AS updated_url;

 SPLIT_PART(string, delimiter, position)

 SELECT TRIM('    dog    ') AS SimpleTrim;

SELECT TRIM(LEADING '"' FROM'"dog"') AS LeadingTrim;

SELECT TRIM(TRAILING '"' FROM'"dog"') AS TrailingTrim;

SELECT TRIM('x' FROM 'xxxHello Worldxxx') AS FromTrim;

 SELECT TRIM('    dog    ') AS SimpleTrim;

SELECT
LTRIM('"dog"', '"') AS LeadingTrim;

SELECT
RTRIM('"dog"', '"') AS TrailingTrim;

SELECT
TRIM('xxxHello Worldxxx', 'x') AS FromTrim;

 UPPER ( string )

 AVG ( [ DISTINCT | ALL ] expression )

 CREATE TABLE example_table (
    my_smallint_column SMALLINT,
    my_integer_column INTEGER,
    my_bigint_column BIGINT,
    my_numeric_column NUMERIC,
    my_decimal_column DECIMAL,
    my_real_column REAL,
    my_double_precision_column DOUBLE PRECISION,
    my_super_column SUPER
);


INSERT INTO example_table (
    my_smallint_column,
    my_integer_column,
    my_bigint_column,
    my_numeric_column,
    my_decimal_column,
    my_real_column,
    my_double_precision_column,
    my_super_column
)
VALUES
    (1, 100, 10000000000, 123.45, 678.90, 3.14, 2.71828, 123),
    (2, 200, 20000000000, 234.56, 789.01, 2.71, 3.14159, 456),
    (3, 300, 30000000000, 345.67, 890.12, 1.41, 1.61803, 789),
    (4, 400, 40000000000, 456.78, 901.23, 1.61, 1.41421, 101112),
    (5, 500, 50000000000, 567.89, 123.45, 2.17, 3.14159, 131415);

 CREATE TABLE example_table (
    my_smallint_column SMALLINT,
    my_integer_column INTEGER,
    my_bigint_column BIGINT,
    my_numeric_column NUMERIC,
    my_decimal_column DECIMAL,
    my_real_column REAL,
    my_double_precision_column DOUBLE PRECISION,
    my_super_column VARIANT
)
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "11/27/2024",  "domain": "test" }}';


INSERT INTO example_table (
    my_smallint_column,
    my_integer_column,
    my_bigint_column,
    my_numeric_column,
    my_decimal_column,
    my_real_column,
    my_double_precision_column,
    my_super_column
)
VALUES
    (1, 100, 10000000000, 123.45, 678.90, 3.14, 2.71828, 123),
    (2, 200, 20000000000, 234.56, 789.01, 2.71, 3.14159, 456),
    (3, 300, 30000000000, 345.67, 890.12, 1.41, 1.61803, 789),
    (4, 400, 40000000000, 456.78, 901.23, 1.61, 1.41421, 101112),
    (5, 500, 50000000000, 567.89, 123.45, 2.17, 3.14159, 131415);

 SELECT
    AVG(DISTINCT my_smallint_column) AS type_smallint,
    AVG(ALL my_integer_column) AS type_integer,
    AVG(my_bigint_column) AS type_bigint,
    AVG(my_numeric_column) AS type_numeric,
    AVG(my_decimal_column) AS type_decimal,
    AVG(my_real_column) AS type_real,
    AVG(my_double_precision_column) AS type_double_precision,
    AVG(my_super_column) AS type_super
FROM example_table;

 SELECT
     AVG(DISTINCT my_smallint_column) AS type_smallint,
     AVG(ALL my_integer_column) AS type_integer,
     AVG(my_bigint_column) AS type_bigint,
     AVG(my_numeric_column) AS type_numeric,
     AVG(my_decimal_column) AS type_decimal,
     AVG(my_real_column) AS type_real,
     AVG(my_double_precision_column) AS type_double_precision,
     AVG(my_super_column) AS type_super
FROM example_table;

 CREATE TABLE test_max_function (
    col1 INT
 );

INSERT INTO test_max_function
VALUES ('200'),
       ('20'),
       ('2'),
       ('2');

SELECT MAX(COL1), MAX(DISTINCT COL1), MAX(ALL COL1) FROM test_max_function;

 CREATE TABLE test_max_function (
    col1 INT
 )
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "11/20/2024",  "domain": "test" }}';

INSERT INTO test_max_function
VALUES ('200'),
       ('20'),
       ('2'),
       ('2');

SELECT MAX(COL1), MAX(DISTINCT COL1), MAX(ALL COL1) FROM
    test_max_function;

 MIN ( [ DISTINCT | ALL ] expression )

 select "numeric"(VARCHAR);

 SELECT "numeric"('2024');

 SELECT
TO_NUMERIC('2024');

 ROUND(number [ , integer ] )

 CREATE TABLE test_sum_function (
    col1 INT
 );

INSERT INTO test_sum_function
VALUES ('200'),
       ('20'),
       ('2'),
       ('2');

SELECT SUM(COL1), SUM(DISTINCT COL1), SUM(ALL COL1) FROM test_sum_function;

 CREATE TABLE test_sum_function (
    col1 INT
 )
COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "11/20/2024",  "domain": "test" }}';

INSERT INTO test_sum_function
VALUES ('200'),
       ('20'),
       ('2'),
       ('2');

SELECT SUM(COL1), SUM(DISTINCT COL1), SUM(ALL COL1) FROM
    test_sum_function;

 TRUNC(number [ , integer ])

 TO_DATE(string, format, [is_strict])

 SELECT TO_DATE('02 Oct 2001', 'DD Mon YYYY');
SELECT TO_DATE('20010631', 'YYYYMMDD', FALSE);
SELECT TO_DATE('20010631', 'YYYYMMDD', TRUE);
SELECT TO_DATE('1,993 12 23', 'Y,YYY MM DD');
SELECT TO_DATE(d, 'YYYY/MM/DD'),
       TO_DATE(d, f)
       FROM (SELECT '2001-01-01'::date as d, 'DD/MM/YYYY' as f);

 SELECT TO_DATE('02 Oct 2001', 'DD Mon YYYY');
SELECT
       TRY_TO_DATE(/*** SSC-FDM-RS0004 - INVALID DATES WILL CAUSE ERRORS IN SNOWFLAKE ***/ '20010631', 'YYYYMMDD');
SELECT TO_DATE('20010631', 'YYYYMMDD');
SELECT TO_DATE('1,993 12 23', 'Y,YYY MM DD') !!!RESOLVE EWI!!! /*** SSC-EWI-PG0005 - Y,YYY MM DD FORMAT MAY FAIL OR MAY HAVE A DIFFERENT BEHAVIOR IN SNOWFLAKE. ***/!!!;
SELECT TO_DATE(d, 'YYYY/MM/DD'),
       --** SSC-FDM-0032 - PARAMETER 'format_string' IS NOT A LITERAL VALUE, TRANSFORMATION COULD NOT BE FULLY APPLIED **
       TO_DATE(d, f)
       FROM (SELECT '2001-01-01'::date as d, 'DD/MM/YYYY' as f);

 SELECT
'{
  "house": {
    "address": {
      "street": "123 Any St.",
      "city": "Any Town",
      "state": "FL",
      "zip": "32830"
    },
    "bathroom": {
      "color": "green",
      "shower": true
    },
    "appliances": {
      "washing machine": {
        "brand": "Any Brand",
        "color": "beige"
      },
      "dryer": {
        "brand": "Any Brand",
        "color": "white"
      }
    }
  }
}' as VALID_JSON,
'notvalidjson' as INVALID_JSON,
JSON_EXTRACT_PATH_TEXT(VALID_JSON, 'house', 'appliances', 'washing machine', 'brand') AS VALID_JSON_FLAG_DEFAULT_OFF,
JSON_EXTRACT_PATH_TEXT(VALID_JSON, 'house', 'appliances', 'washing machine', 'brand', false) AS VALID_JSON_FLAG_OFF,
JSON_EXTRACT_PATH_TEXT(VALID_JSON, 'house', 'appliances', 'washing machine', 'brand', true) AS VALID_JSON_FLAG_TRUE,
JSON_EXTRACT_PATH_TEXT(INVALID_JSON, 'house', 'appliances', 'washing machine', 'brand', true) AS INVALID_JSON_FLAG_TRUE,
JSON_EXTRACT_PATH_TEXT(INVALID_JSON, 'house', 'appliances', 'washing machine', 'brand', false) AS INVALID_JSON_FLAG_FALSE
;

 SELECT
'{
  "house": {
    "address": {
      "street": "123 Any St.",
      "city": "Any Town",
      "state": "FL",
      "zip": "32830"
    },
    "bathroom": {
      "color": "green",
      "shower": true
    },
    "appliances": {
      "washing machine": {
        "brand": "Any Brand",
        "color": "beige"
      },
      "dryer": {
        "brand": "Any Brand",
        "color": "white"
      }
    }
  }
}' as VALID_JSON,
'notvalidjson' as INVALID_JSON,
JSON_EXTRACT_PATH_TEXT(VALID_JSON, ARRAY_TO_STRING(['house', 'appliances', '"washing machine"', 'brand'], '.')) AS VALID_JSON_FLAG_DEFAULT_OFF,
JSON_EXTRACT_PATH_TEXT(VALID_JSON, ARRAY_TO_STRING(['house', 'appliances', '"washing machine"', 'brand'], '.')) AS VALID_JSON_FLAG_OFF,
JSON_EXTRACT_PATH_TEXT(TRY_PARSE_JSON(VALID_JSON), ARRAY_TO_STRING(['house', 'appliances', '"washing machine"', 'brand'], '.')) AS VALID_JSON_FLAG_TRUE,
JSON_EXTRACT_PATH_TEXT(TRY_PARSE_JSON(INVALID_JSON), ARRAY_TO_STRING(['house', 'appliances', '"washing machine"', 'brand'], '.')) AS INVALID_JSON_FLAG_TRUE,
JSON_EXTRACT_PATH_TEXT(INVALID_JSON, ARRAY_TO_STRING(['house', 'appliances', '"washing machine"', 'brand'], '.')) AS INVALID_JSON_FLAG_FALSE
;

 SELECT
  'appliances' level_2,
  'brand' level_4,
  JSON_EXTRACT_PATH_TEXT(
    INFO.VALID_JSON,
    'house',
    level_2,
    'washing machine',
    level_4
  ) result
FROM
  (
    SELECT
      '{
  "house": {
    "address": {
      "street": "123 Any St.",
      "city": "Any Town",
      "state": "FL",
      "zip": "32830"
    },
    "bathroom": {
      "color": "green",
      "shower": true
    },
    "appliances": {
      "washing machine": {
        "brand": "Any Brand",
        "color": "beige"
      },
      "dryer": {
        "brand": "Any Brand",
        "color": "white"
      }
    }
  }
}' AS VALID_JSON
  ) INFO;

 SELECT
  'appliances' level_2,
  'brand' level_4,
  JSON_EXTRACT_PATH_TEXT(
  INFO.VALID_JSON, ARRAY_TO_STRING(['house',
  level_2, '"washing machine"',
  level_4], '.')) result
FROM
  (
    SELECT
      '{
  "house": {
    "address": {
      "street": "123 Any St.",
      "city": "Any Town",
      "state": "FL",
      "zip": "32830"
    },
    "bathroom": {
      "color": "green",
      "shower": true
    },
    "appliances": {
      "washing machine": {
        "brand": "Any Brand",
        "color": "beige"
      },
      "dryer": {
        "brand": "Any Brand",
        "color": "white"
      }
    }
  }
}' AS VALID_JSON
  ) INFO;