Provide a full explanation of the trigger using an example in the database.
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Q: u help me with a practical
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Provide a full explanation of the trigger using an example in the
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- What do nulls specifically mean? What kind of field prohibits invalid values? Why?How do you manage cascading actions in database triggers, and what precautions should be taken?Produce the DSA key generation algorithm. Explain the steps. Explain the DSA signing and verification steps. (assignment can be done in groups of 2 or 3). Elements need to be explained properly.
- A trigger's execution might result in the execution of another action. The depth of nesting in most database systems has a limit. Explain why they would put such a restriction in place.Not all versions of this database include referential integrity constraints for all foreign keys. Use whatever commands are available for the RDBMS you are using, investigate if any referential integrity constraints are missing. Write any missing constraints and, if possible, add them to the associated table definitions.You will need to create the database tables and choose sensible data types for each column.Make sure to maintain entity and referential integrity, and implement all the above constraints.Since other developers work in parallel on other parts of the system, you will need to strictly follow the above specification to correctly implemented in your database. Otherwise, the other software will not be able to use your database. This means, one needs to be able to rely on all constraints being correct, the spelling of table and column names being as given, and that the data types that you chose will allow for sensible data to be added to the database in the future.For testing purposes, you are asked to insert the data specified below into the tables, but no other data except this.In short:1. You will need to create the tables as specified2. You will need to add the data specified Please use the 3.sql and implement your tables using the sketched CREATE TABLE commands. Add the necessary queries…
- What do nulls actually mean? What kind of field cannot allow null values? Why?Using the World database, two updates are needed for one row in the City table. The city of Giumri in Armenia (country code ‘ARM’) is spelled incorrectly in the table. It should be spelled ‘Gyumri’. Also, the district is currently ‘irak’ in the table and should be ‘Irak’. Make these changes in one construct.Create a SQL statement in MariaDB with the following columns and their aliases from the Employees table. Aliases should be created as seen including case sensitive. (A full statement is required, but doesnt need to be run with an output) Screenshot the code ONLY and attach. last_name - Name street_address - Local Address phone_number - Phone #