What is MySQL default value?
What is MySQL default value?
0
For numeric types, the default is 0 , with the exception that for integer or floating-point types declared with the AUTO_INCREMENT attribute, the default is the next value in the sequence. For date and time types other than TIMESTAMP , the default is the appropriate “zero” value for the type.
Which data type is the default type?
Default Values
| Data Type | Default Value (for fields) |
|---|---|
| float | 0.0f |
| double | 0.0d |
| char | ” |
| String (or any object) | null |
What is the default value of varchar in MySQL?
NULL is the actual NULL value meaning if no value is provided on an insert the column will default to NULL (empty). For varchar you can set default to ”, but NULL is better. Autoincrement int types shouldn’t have a default value (Default: None) because it will always have a value.
How do I change the default value in mysql workbench?
To change the name, data type, default value, or comment of a column, double-click the value to edit it. You can also add column comments to the Column Comment field. It is also possible to set the column collation, using the list in the Column Details panel.
What is the default value for a column in MySQL?
For a given table, the SHOW CREATE TABLE statement displays which columns have an explicit DEFAULT clause. Implicit defaults are defined as follows: For numeric types, the default is 0 , with the exception that for integer or floating-point types declared with the AUTO_INCREMENT attribute, the default is the next value in the sequence.
How to set default JSON type in MySQL?
Set default value to a JSON type column in MySQL? To set default value, use the DEFAULT constraint as in the below syntax − Here is the description of table. Following is the query − Following is the query to change it to JSON data type with default value −
How to set default values in SQL Server?
You can use following syntax, For more information see this question and answers : Add a column with a default value to an existing table in SQL Server. Syntax : ALTER TABLE {TABLENAME} ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL} CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE} WITH VALUES. Example :
How to specify a default value for a column?
Use SSMS to specify a default. You can use the Object Explorer to specify a default value for a table column. In Object Explorer, right-click the table with columns for which you want to change the scale and click Design. Select the column for which you want to specify a default value.