When is it OK to use union compatibility between two select statements that utilize the same table?
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- Under what circumstances is it appropriate to say that two select statements from the same table both satisfy the union's requirements?What is the main difference between UNION and UNION ALL?In java create an application to manage your data base information the database is already created in mysql tables, the tables are fill, So the user can use your database application user friendly Retrieve all data: Given a table name, retrieve all data from the table and present it to the user. Average: Given a table name and a column name, return the average of the column. Here the assumption is that the column type will be numeric (e.g., cost column). Insert: Given a table name, your program should show the column names of that table and ask the users to input new data to the table. In case of errors, your program should directly show the MySQL errors to the users. Assumption 1: Users will enter data according to the database constraints. Assumption 2: Users will input one record at a time. Delete: Given a table name, your program should show the column names of that table and ask the users to input data that they want to delete. Assumption 1: Users will enter data according to the…
- In what circumstances does it make sense to assume that two select statements from the same database are consistent with one another?According to tables below, write 3 SELECT statements to exemplify LEFT, RIGHT and FULL OUTER JOIN statements.Open your text editor and create a new document named model.php model.php will contain functions that will connect to a database potentially return PDO statementobjects to the controller for processing. updateMessagesfunction updateMessages($id)This method will take a single parameter of id which is the saved id from the last or latest message displayed. It will conditionally select from the table “messages”, id, name, message, and time. The condition is that the field id is greater than the parameter for id. The return is the PDOStatement object with the row data from the query.
- Code should be in Python Prompt the user for a title for data. Output the title.Ex: Enter a title for the data: Number of Novels Authored You entered: Number of Novels Authored Prompt the user for the headers of two columns of a table. Output the column headers.Ex: Enter the column 1 header: Author name You entered: Author name Enter the column 2 header: Number of novels You entered: Number of novels Prompt the user for data points. Data points must be in this format: string, int. Store the information before the comma into a string variable and the information after the comma into an integer. The user will enter -1 when they have finished entering data points. Output the data points. Store the string components of the data points in a list of strings. Store the integer components of the data points in a list of integers.Ex: Enter a data point (-1 to stop input): Jane Austen, 6 Data string: Jane Austen Data integer: 6 Perform error checking for the data point entries. If any of the…ID At_fault_claims 1001 0 1001 1 1002 0 1002 1 1002 1 1003 0 1004 1 1005 1 1005 0 Aggregate the the dataframe above at the ID to create the following claim count variables: : Number of At Fault claims Number of Not At Fault claims it should be written with python We should now have two additional columns 'at fault count' and 'not at fault count' in our aggregate dataframeThis is a database system question regarding SELECT: Which of the following statements is true for SELECT statements in general? a. HAVING is executed before WHERE when running an SQL query b. SELECT is executed before FROM when running an SQL query c. Each SELECT clause must have a WHERE clause as well. d. COUNT(column_name) function returns the number of values in the column, including any NULLs e. HAVING clause specifies a condition for selecting grouped tuples from the GROUP BY clause.
- What is Order By clause ?What, precisely, is the function of the delete operator?INFO 2303 Database Programing Assignment # : PL/SQL Procedure & Function Practice Note: PL/SQL can be executed in SQL*Plus or SQL Developer or Oracle Live SQL. Write a function that takes patient date of birth. If the patient born after 30th June 1990 then he/she will be required to set appointment for immunization. Call this function from anonymous block to allow the user to enter the patient ID. Expected output: Enter the patient ID: 168 The status of X-immunization : REQUIRED