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Suppose I have a table with a serial as primary key and couple of other columns, that are all nullable. Is there any way to insert a new row in that table by omitting all the columns in the insert clause? Since serial is auto-incremental and can be omitted right? The rest of columns can be null and can therefore be omitted too? So theoretically it should be possible somehow. But is it?

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Yes, you can use the default values clause (at least in Postgres):

insert into some_table
default values;

Online example

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    For MySQL it will be insert into test (id) values (null);
    – Akina
    May 15 '20 at 5:53
  • @Akina But that would insert a NULL value in the id column. That should be insert into test (id) values (default) if you do need to list a column. May 15 '20 at 6:14
  • In MySQL inserting NULL value into autoincremented field causes next value generation.
    – Akina
    May 15 '20 at 6:16
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    That should be insert into test (id) values (default) if you do need to list a column It is correct too. If you not list the column then you must add default for each field: insert into test values (default, default, default) - if not then "the amount of values doesn't match the amount of columns" error will be generated.
    – Akina
    May 15 '20 at 6:19
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    Using AUTO_INCREMENT: (if) No value was specified for the AUTO_INCREMENT column, so MySQL assigned sequence numbers automatically. You can also explicitly assign 0 to the column to generate sequence numbers, unless the NO_AUTO_VALUE_ON_ZERO SQL mode is enabled. ... If the column is declared NOT NULL, it is also possible to assign NULL to the column to generate sequence numbers.
    – Akina
    May 15 '20 at 6:30

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