SnowConvert AI - Redshift - Littéraux¶

Description ¶

Un littéral ou une constante est une valeur de données fixe, composée d’une séquence de caractères ou d’une constante numérique. (Référence linguistique Redshift SQL Littéraux).

Amazon Redshift prend en charge plusieurs types de littéraux, notamment :

Littéraux numériques pour les nombres entiers, décimaux et à virgule flottante.
Littéraux de caractères, également appelés chaînes, chaînes de caractères ou constantes de caractères.
Littéraux de date et d’intervalle, utilisés avec les types de données de type date.

Modèles d’échantillons de sources¶

Code d’entrée :¶

Redshift¶

 -- Number literals.
SELECT 42 AS integer_literal, -- Simple integer
    -123 AS negative_integer, -- Negative integer
    3.14159 AS decimal_literal, -- Decimal number
    1E0 AS simple_float; -- Floating-point representation of 1

-- Character literals.   
SELECT 'Hello, World!' AS simple_string,
    'Line1\nLine2' AS newline_character, -- Interprets \n as literal
    'Tab\tCharacter' AS tab_character, -- Interprets \t as literal
    'The value is ' || 42 AS mixed_literal;

Résultat¶


entier_littéral	négatif_entier	décimal_littéral	simple_flottant
42	-123	3,14159	1


simple_chaîne	nouvelle ligne_caractère	tabulation_caractère	mixte_littéral
42	<p>Ligne 1 </p><p>Ligne 2</p>	Caractère de tabulation	La valeur est 42.

Code de sortie :

Snowflake¶

 -- Number literals.
SELECT 42 AS integer_literal, -- Simple integer
    -123 AS negative_integer, -- Negative integer
    3.14159 AS decimal_literal, -- Decimal number
    1E0 AS simple_float; -- Floating-point representation of 1

-- Character literals.   
SELECT 'Hello, World!' AS simple_string,
    'Line1\nLine2' AS newline_character, -- Interprets \n as literal
    'Tab\tCharacter' AS tab_character, -- Interprets \t as literal
    'The value is ' || 42 AS mixed_literal;

Résultat¶


entier_littéral	négatif_entier	décimal_littéral	simple_flottant
42	-123	3,14159	1


simple_chaîne	nouvelle ligne_caractère	tabulation_caractère	mixte_littéral
42	<p>Ligne 1 </p><p>Ligne 2</p>	Caractère de tabulation	La valeur est 42.

Known Issues¶

Cette fonctionnalité n’est pas prise en charge actuellement dans Snowflake, mais elle le sera lors d’une prochaine migration.

 select $MyTagForLiteral$
This is
a test
of a tag literal
$MyTagForLiteral$ as c1;

Littéraux de date, d’heure et d’horodatage¶

Description ¶

Littéraux de date, d’heure et d’horodatage pris en charge par Amazon Redshift. (Référence linguistique Redshift SQL Littéraux de date, d’heure et d’horodatage).

Modèles d’échantillons de sources¶

Code d’entrée :¶

Redshift¶

 --invalid
SELECT
DATEADD(month, 1, 'January 8, 1999'),
DATEADD(month, 1, '2000-Jan-31'),
DATEADD(month, 1, 'Jan-31-2000'),
DATEADD(month, 1, '20000215'),
DATEADD(month, 1, '080215'),
DATEADD(month, 1, '2008.366'),
DATEADD(month, 1, 'now');

--valid
SELECT
DATEADD(month, 1, '1999-01-08'),
DATEADD(month, 1, '1/8/1999'),
DATEADD(month, 1, '01/02/00'),
DATEADD(month, 1, '31-Jan-2000');

Code de sortie :

Snowflake¶

 --invalid
SELECT
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - 'January 8, 1999' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! 'January 8, 1999'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - '2000-Jan-31' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! '2000-Jan-31'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - 'Jan-31-2000' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! 'Jan-31-2000'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - '20000215' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! '20000215'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - '080215' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! '080215'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - '2008.366' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! '2008.366'),
 DATEADD(month, 1,
                   !!!RESOLVE EWI!!! /*** SSC-EWI-RS0007 - 'now' DATE LITERAL IS NOT SUPPORTED IN SNOWFLAKE. ***/!!! 'now');

--valid
SELECT
 DATEADD(month, 1, '1999-01-08'),
 DATEADD(month, 1, '1/8/1999'),
 DATEADD(month, 1, '01/02/00'),
 DATEADD(month, 1, '31-Jan-2000');

Known Issues¶

Certains formats DATE, TIME, et TIMESTAMP peuvent produire des résultats différents dans Redshift par rapport à Snowflake.

EWIs connexes¶

SSC-EWI-RS0007 : le littéral de date n’est pas pris en charge dans Snowflake.

Littéraux d’intervalles¶

Description ¶

Les littéraux d’intervalles peuvent être utilisés dans les calculs de durée, tels que l’ajout d’intervalles aux dates et aux horodatages, la somme d’intervalles et la soustraction d’un intervalle d’une date ou d’un horodatage. Les littéraux d’intervalle peuvent être utilisés comme valeurs d’entrée pour les colonnes de type de données d’intervalle dans une table. (Référence linguistique Redshift SQL Littéraux d’intervalle).

Avertissement

Cette grammaire est partiellement prise en charge par Snowflake.

Grammar Syntax ¶

 INTERVAL quoted-string [ year_to_month_qualifier ]
INTERVAL quoted-string [ day_to_second_qualifier ] [ (fractional_precision) ]

Les intervalles de Snowflake ne peuvent être utilisés que dans les opérations arithmétiques. Les intervalles utilisés dans tout autre scénario ne sont pas pris en charge.

Les formats suivants sont les seuls formats reconnus et entièrement transformés par SnowConvert AI, permettant des champs facultatifs et la plupart des abréviations sans style d’intervalle :

1 year 1 month 1 day 2 hour 3 minutes 4 seconds 123 ms
hh:mm:ss.ms
1 year 1 month 1 day hh:mm:ss.ms

Snowflake ne prend pas en charge les littéraux avec des signes arithmétiques. Si le littéral contient une expression horaire, l’expression peut être partiellement transformée.

Modèles d’échantillons de sources¶

Scénarios pris en charge¶

Code d’entrée :¶

Redshift¶

 SELECT 
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1year 1month 1day 2hour 3 minute 4.1233455second' AS c1,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1year 1month 1day 2hour 3 minute 4.123second' AS c2,
'2024-01-01 00:00:00' ::TIMESTAMP +  INTERVAL '1.234567' AS c3,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' AS c4,
('2024-01-01 00:00:00'::timestamp without time zone + '1 day 02:03:04.123'::interval) AS c5,
('2024-01-01 00:00:00'::timestamp without time zone + '1 year 1 mon 00:00:01'::interval) AS c6,
('2024-01-01 00:00:00'::timestamp without time zone + '1 year 1 mon'::interval) AS c7,
('2024-01-01 00:00:00'::timestamp without time zone + '00:00:01.234567'::interval) AS c8,
('2024-01-01 00:00:00'::timestamp without time zone + '1 year 1 mon 1 day 02:03:04.123'::interval) AS c9,
('2024-01-01 00:00:00'::timestamp without time zone + '00:03:04.5678'::interval) AS c10,
('2024-01-01 00:00:00'::timestamp without time zone + '1 day 02:03:00'::interval) AS c11,
('2024-01-01 00:00:00'::timestamp without time zone + '3 days 01:59:00'::interval) AS c11,
('2024-01-01 00:00:00'::timestamp without time zone + '1 year 1 mon'::interval) AS c12,
('2024-01-01 00:00:00'::timestamp without time zone + '10 years'::interval) AS c13,
('2024-01-01 00:00:00'::timestamp without time zone + '1000 years'::interval) AS c14,
('2024-01-01 00:00:00'::timestamp without time zone + '100 years'::interval) AS c15,
('2024-01-01 00:00:00'::timestamp without time zone + '1 year 1 mon'::interval) AS c16
;

Code de sortie :¶

Snowflake¶

 SELECT
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1year, 1month, 1day, 2hour, 3 minute, 4 seconds, 123 ms' AS c1,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1year, 1month, 1day, 2hour, 3 minute, 4 seconds, 123 ms' AS c2,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 seconds, 234 ms' AS c3,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' AS c4,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 day, 02 hour, 03 minutes, 04 seconds, 123 ms') AS c5,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon, 00 hour, 00 minutes, 01 seconds') AS c6,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon') AS c7,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '00 hour, 00 minutes, 01 seconds, 234 ms') AS c8,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon, 1 day, 02 hour, 03 minutes, 04 seconds, 123 ms') AS c9,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '00 hour, 03 minutes, 04 seconds, 567 ms') AS c10,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 day, 02 hour, 03 minutes, 00 seconds') AS c11,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '3 days , 01 hour, 59 minutes, 00 seconds') AS c11,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon') AS c12,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '10 years') AS c13,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1000 years') AS c14,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '100 years') AS c15,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon') AS c16
;

Scénarios de traduction en attente¶

Code d’entrée :¶

Redshift¶

 SELECT
INTERVAL '1year 1month 1day 2hour 3 minute 4.1233455second',
'2024-01-01 00:00:00' ::TIMESTAMP +  INTERVAL '1.234567' SECOND AS c2,
'2024-01-01 00:00:00' ::TIMESTAMP +  INTERVAL '1.234567' SECOND (3) AS c3,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' YEAR AS c4,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' MONTH AS c5,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 2:3:4.5678' DAY TO MINUTE AS c6,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 2:3:4.5678' DAY TO SECOND AS c7,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 2:3' AS c8,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 49:59:0' AS c9,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 49:59:0' DAY AS c10,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 - 1 1'  AS c11,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1-1' AS c12,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 year -1 day' AS c13,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '3:4.5678' AS c14,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1-1 0 second 0 millisecond' AS c15,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 decade' AS c16,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 millenium' AS c17,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 century' AS c18,
('2024-01-01 00:00:00'::timestamp without time zone + ('00:00:01.234567')::interval second) AS c19,
('2024-01-01 00:00:00'::timestamp without time zone + ('00:00:01.235')::interval second (3)) AS c20,
('2024-01-01 00:00:00'::timestamp without time zone + ('1 year')::interval year) AS c21,
('2024-01-01 00:00:00'::timestamp without time zone + ('1 year 1 mon')::interval month) AS c22,
('2024-01-01 00:00:00'::timestamp without time zone + ('1 day 02:03:00')::interval day to minute) AS c23,
('2024-01-01 00:00:00'::timestamp without time zone + ('1 day 02:03:04.5678')::interval day to second) AS c24,
('2024-01-01 00:00:00'::timestamp without time zone + '-01:56:55.877'::interval) AS c25,
('2024-01-01 00:00:00'::timestamp without time zone + ('3 days')::interval day) AS c26;

Code de sortie :¶

Snowflake¶

 SELECT
INTERVAL '1year 1month 1day 2hour 3 minute 4.1233455second' !!!RESOLVE EWI!!! /*** SSC-EWI-0107 - INTERVAL LITERAL IS NOT SUPPORTED BY SNOWFLAKE IN THIS SCENARIO  ***/!!!,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 seconds, 234 ms' SECOND !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c2,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 seconds, 234 ms' SECOND (3) !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c3,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' YEAR !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c4,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '13 months' MONTH !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c5,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 , 2 hour, 3 minutes, 4 seconds, 567 ms' DAY TO MINUTE !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!!!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c6,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 , 2 hour, 3 minutes, 4 seconds, 567 ms' DAY TO SECOND !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!!!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c7,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 2:3' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c8,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 , 49 hour, 59 minutes, 0 seconds' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c9,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 , 49 hour, 59 minutes, 0 seconds' DAY !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!!!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c10,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 - 1 1' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!  AS c11,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1-1' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c12,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 year -1 day' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c13,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '3:4.5678' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c14,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1-1 0 second 0 millisecond' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c15,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 decade' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c16,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 millenium' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c17,
'2024-01-01 00:00:00' ::TIMESTAMP + INTERVAL '1 century' !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!! AS c18,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '00 hour, 00 minutes, 01 seconds, 234 ms' second !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c19,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '00 hour, 00 minutes, 01 seconds, 235 ms' second (3) !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c20,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year' year !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c21,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 year, 1 mon' month !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c22,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 day, 02 hour, 03 minutes, 00 seconds' day to minute !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c23,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + INTERVAL '1 day, 02 hour, 03 minutes, 04 seconds, 567 ms' day to second !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c24,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + '-01:56:55.877':: VARCHAR !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - INTERVAL DATA TYPE CONVERTED TO VARCHAR ***/!!!!!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c25,
('2024-01-01 00:00:00':: TIMESTAMP_NTZ + ('3 days'):: VARCHAR !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - INTERVAL DATA TYPE CONVERTED TO VARCHAR ***/!!!!!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'INTERVAL FORMAT' NODE ***/!!!) AS c26;

Known Issues¶

Aucun problème n’a été constaté.

EWIs connexes¶

SSC-EWI-0107 : intervalle littéral non pris en charge dans le scénario actuel.
SSC-EWI-0073 : En attente de l’examen de l’équivalence fonctionnelle.

NULLS¶

Description ¶

Si une colonne d’une ligne est manquante, inconnue ou sans application, il s’agit d’une valeur nulle ou on dit qu’elle contient null. (Référence linguistique Redshift SQL Littéraux null).

Les Null peuvent apparaître dans les champs de n’importe quel type de données qui ne sont pas limités par des contraintes de clé primaire ou de NOT NULL. Un null n’est pas équivalent à la valeur zéro ou à une chaîne vide.

Modèles d’échantillons de sources¶

Code d’entrée :¶

Redshift¶

 SELECT NULL IN (NULL, 0, 1, 2 ,3, 4);
SELECT 1 + NULL, 1 - NULL, 1 * NULL, 1 / NULL, 1 % NULL;

Résultat¶


Select1
NULL


1+NULL	1*NULL
NULL	NULL

Code de sortie :

Snowflake¶

 SELECT NULL IN (NULL, 0, 1, 2 ,3, 4);
SELECT 1 + NULL, 1 - NULL, 1 * NULL, 1 / NULL, 1 % NULL;

Résultat¶


Select1
NULL


1+NULL	1*NULL
NULL	NULL

Known Issues¶

Aucun problème n’a été constaté.

EWIs connexes¶

Il n’y a pas de problème connu.