@giovanny.lueilwitz
To set a value to NULL
in PostgreSQL, you can use the NULL
keyword. For example:
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UPDATE table_name SET column_name = NULL WHERE condition; |
This will update the value of column_name
in all rows that meet the condition to NULL
.
You can also use the NULL
keyword to insert a NULL
value into a table. For example:
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INSERT INTO table_name (column1, column2, column3) VALUES (value1, NULL, value3); |
This will insert a new row into table_name
with value1
in column1
, NULL
in column2
, and value3
in column3
.
Keep in mind that NULL
is not the same as an empty string (''
) or a zero value (0
). A NULL
value represents an unknown or undefined value, whereas an empty string or a zero value represents a known value.
For more information on NULL
values in PostgreSQL, you can refer to the documentation: https://www.postgresql.org/docs/current/sql-expressions.html#SQL-SYNTAX-NULL-HANDLING