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Explicitly enter a NULL.

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SQL Server
	Run the tidy code silently INSERT INTO t_peep VALUES (4677, NULL)
Specific to SQL Server
none

Related links:

INSERT, UPDATE and DELETE

INSERT is used to add records.
UPDATE can change an existing record.
DELETE removes records.
'INSERT..SELECT' copies data from a SELECT into a table.
INSERT: Not all fields need be specified. Default values may be specified in the CREATE TABLE clause - otherwise NULL is used.
Insert a date.
Explicitly enter a NULL.
Can't INSERT because of reference.
Cannot DELETE because of reference.
Can't insert data because of incompatable formats.
String contains a quote '
to select the data from 20 different columns into one changing the values according to one other column consisting the positions of the 20 columns