Contents
How to add data to a table in MariaDB?
Adding Data To add data to a table in MariaDB, you will need to use the INSERT statement. Its basic, minimal syntax is the command INSERT followed by the table name and then the keyword VALUES with a comma separated list of values contained in parentheses: INSERT table1 VALUES(‘text1′,’text2′,’text3’);
Is it optional to name columns in MariaDB?
If you don’t want to insert data into all of the columns of a table, though, you could name the columns desired: Notice that the keyword INTO was added here. This is optional and has no effect on MariaDB. It’s only a matter of grammatical preference. In this example we not only name the columns, but we list them in a different order.
When to use a replace statement in MariaDB?
However, there may be times when you actually want to replace the rows with the same key fields with the new ones. In such a situation, instead of using INSERT you can use a REPLACE statement: Notice that the syntax is the same as an INSERT statement. The flags all have the same effect, as well.
When to use a null value in MariaDB?
This means that there are no default values and a null value is allowed and will be used if a value isn’t specified when a row is created. To be able to specify a default value other than NULL, an ALTER TABLE statement can be entered with a SET clause.
Why does the UPDATE statement not abort in MariaDB?
If you use the IGNORE keyword, the update statement does not abort even if errors occur during the update. Rows for which duplicate-key conflicts occur are not updated. Rows for which columns are updated to values that would cause data conversion errors are updated to the closest valid values instead.
When to use or replace clause in MariaDB?
If the OR REPLACE clause is used and the table already exists, then instead of returning an error, the server will drop the existing table and replace it with the newly defined table. This syntax was originally added to make replication more robust if it has to rollback and repeat statements such as CREATE
Can you use order by and limit in MariaDB?
In this case, ORDER BY and LIMIT cannot be used. This restriction was lifted in MariaDB 10.3.2 and both clauses can be used with multiple-table updates. An UPDATE can also reference tables which are located in different databases; see Identifier Qualifiers for the syntax.