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Explicitly enter a NULL
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From SQLZoo
Explicitly enter a NULL.
schema:scott
DELETE
FROM
t_peep
WHERE
id
=
4677
INSERT
INTO
t_peep
VALUES
(
4677
,
NULL
)
INSERT and DELETE Operations
INSERT new records
UPDATE existing records
DELETE records
INSERT ... SELECT
INSERT: Not all fields need to be specified
INSERT a date
Explicitly enter a NULL
INSERT problems: reference
DELETE problems: reference
INSERT problems: incompatible formats
String contains a quote '
Data normalization
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