In MySQL, executing Insert, Update and Delete can cause problems. What are some practices that you can deploy to prevent accidental changes to tables? Please and thank you
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In MySQL, executing Insert, Update and Delete can cause problems. What are some practices that you can deploy to prevent accidental changes to tables?
Please and thank you
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- How do you create an index? How do you create a unique index? What is the difference between an index and a unique index?Error Functions What type of error occurs with a VLOOKUP) function when there is no corresponding match between a source table and a lookup table? OPTIONS: No matching values #N/A Error #DIV/0Explain the problems that unnormalized tables have for insert, update, and delete actions
- How should best practises be followed when importing tables from MySQL or any other database using Sqoop?Aim: We will learn how to join tables and how to retrieve data from multiple tables.When data from more than one table in the database are needed, the two tables are joined together. Rows are joinedtogether using common values, most of the time these are primary and foreign keys that provide a link between thetwo tables.The syntax of a simple join condition is:SELECT table1.column1, table1.column2,..., table2.column1, table2.column2FROM table1, table2WHERE table1.column1=table2.column2**Please note that you may actually use as many tables as you need. You are not limited to use only twotables.Example:SELECT *FROM DEPARTMENTS;SELECT *FROM EMPLOYEES;Now join departments and employees tables.SELECT FIRST_NAME, DEPARTMENT_NAMEFROM EMPLOYEES, DEPARTMENTSWHERE EMPLOYEES.DEPARTMENT_ID = DEPARTMENTS.DEPARTMENT_ID;NOTE: If you omit the join condition, the result will be the Cartesian Product of the two tables. A CartesianProduct joins all rows of the first table with all rows of the second…When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?
- A select operation in a relational database is used to reduce the size of a table by deleting columns that meet particular requirements.Is this true or false?PLZ help with the following: A table R can be linked with more than one tables at the same time. Select one: True FalseIt takes a special command to copy and paste information between tables.
- Create the following tables using MySQL CLI. Take a screenshot of each CREATE TABLE command that is successfully executed. School Column Name Data Type Length Decimal Places Primary Key? schoolNumber Integer yes name VarChar 200 address VarChar 95 phoneNumber VarChar 10 built Date size IntegerWhen creating DB tables that contain foreign key references to other tables, you must: first create the table in which the primary key is a foreign key B first create the table in which the foreign key is a primary key first remove all integrity constraints it does not matter, you are free to create any table first Question 3 1 F The 99MI format model does one of the following: A prefaces negative value with minus sign as in -12 displays minutes together with the hours as in 12:34 displays months as digits as in 12 months displays Medium-size-Integers, i.e. with no decimal pointWhat are the differences between DELETE and TRUNCATE TABLE? Provide practical example for each.