PostgreSQL Triggers are database callback functions, which are automatically performed/invoked when a specified database event occurs. The following are important points about PostgreSQL triggers − PostgreSQL trigger can be specified to fireBefore…
Following is an example of a material scatters chart with X-Axis on top. We've already seen the configuration used to draw this chart in the Google Charts Configuration Syntax chapter. So, let's…
The CREATE TABLE statement is used for creating a new table in Derby database. Syntax Following is the syntax of the CREATE statement. CREATE TABLE table_name ( column_name1 column_data_type1 constraint…
You can rename a table or a column temporarily by giving another name, which is known as ALIAS. The use of table aliases means to rename a table in a particular…
Once you get connected with the MySQL server, it is required to select a database to work with. This is because there might be more than one database available with…
Following is an example of material scatter chart with a dual Y-axis. We've already seen the configuration used to draw this chart in the Google Charts Configuration Syntax chapter. So, let's see…
The PostgreSQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with…
The PostgreSQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use UNION, each SELECT must have the same number of…
Drop a Database using mysqladmin You would need special privileges to create or to delete a MySQL database. So, assuming you have access to the root user, you can create…
Following is an example of material scatter chart. We've already seen the configuration used to draw this chart in the Google Charts Configuration Syntax chapter. So, let's see the complete example. Configurations…