How to Insert into a Table That Specifies a Default Value for Every Column

How to insert into a table that specifies a DEFAULT value for every column?

Use the DEFAULT VALUES option:

INSERT INTO IdentitySpecification
DEFAULT VALUES;

Inserting into table with a Default column value

Well, in your statement #1, if you omit the list of columns, you must supply values for all three columns, and you're not doing that. That's why it fails if you provide only two of those values.

And your statement #2 should probably be:

INSERT INTO Persons(name, age) values('Bob', 20)

and then you're clearly specifying which columns to insert into (name and age) and you're providing the two values required to fill two columns - that's why it works. The third column will be filled with the configured default, since you didn't specify anything for it.

For these reasons, I would recommend to always explicitly specify the list of columns you want to insert data into - don't just omit that list and assume that you're getting all columns right.....

Insert values and default on all others columns

When you specify a column list in an insert statement, all the columns not specified will get the default value defined for them, or null is a value isn't explicitly defined. So, to make a long story short, you should only specify the columns and the values you care about, and let the database handle the other columns itself:

INSERT INTO [my_table] 
([column_3], [column_5], [column_6])
VALUES ('1', '2', '3')

How to insert default values in SQL table?

Just don't include the columns that you want to use the default value for in your insert statement. For instance:

INSERT INTO table1 (field1, field3) VALUES (5, 10);

...will take the default values for field2 and field4, and assign 5 to field1 and 10 to field3.

INSERT INTO with default values for a single column

Assuming the id column is defined as serial or identity you can specify a column list and set the column value to default:

insert into user_id (id) values (default);

This also works if you have more columns, e.g:

insert into users (id, firstname, lastname) 
values (default, 'Arthur', 'Dent');

Or you can leave out the column list completely and request the default value(s) for all columns:

insert into user_id default values;

INSERT INTO using a query, and add a default value

Just add the default value to your select list.

INSERT INTO five_column_table
SELECT column_a, column_b, column_c, column_d, 'Default Value'
FROM four_column_table;

Insert Row into Postgresql Table with Only Default Values

I found that there is special syntax for this exact use-case:

INSERT INTO test_table DEFAULT VALUES;

T-SQL insert with select and extra column populated by default value

The error messages have already given you the answer.

In the first case, if the number of columns of ADDRESS_HIST is different from that of ADDRESS, you have to specify the columns like

INSERT INTO TABLE_NAME 
(column1, column2, column3,...columnN) VALUES
(value1, value2, value3,...valueN);

In the second case, obviously you're inserting a null value into a non-nullable column of ADDRESS_HIST.



Related Topics



Leave a reply



Submit