Here are the SQL DDL statements to create and alter the tables as per the requirements: 1. Create USERS table with a unique constraint on the Email column: ```sql CREATE TABLE USERS ( USERID NUMBER PRIMARY KEY, USERNAME VARCHAR2(100) NOT NULL, EMAIL VARCHAR2(100) NOT NULL, CONSTRAINT Users_Email_uk UNIQUE (EMAIL) ); ``` 2. Create INGREDIENTS table with a unique constraint on the IngredientID column: ```sql CREATE TABLE INGREDIENTS ( INGREDIENTID NUMBER PRIMARY KEY, RECIPEID NUMBER NOT NULL, INGREDIENTNAME VARCHAR2(100) NOT NULL, CONSTRAINT unique_ingredient_id UNIQUE (INGREDIENTID) ); ``` 3. Remove the unique constraint named Users_Email_uk from the USERS table: ```sql ALTER TABLE USERS DROP CONSTRAINT Users_Email_uk; ``` 4. Create RECIPES table and add a new unique constraint on the RecipeName column: ```sql CREATE TABLE RECIPES ( RECIPEID NUMBER PRIMARY KEY, USERID NUMBER NOT NULL, RECIPENAME VARCHAR2(100) NOT NULL ); ALTER TABLE RECIPES ADD CONSTRAINT Recipes_RecipeName_uk UNIQUE (RECIPENAME); ``` Please note that the actual table creation and alteration status will depend on the execution of these statements in your database environment.

David is developing a recipe management system for a cooking app. The system tracks users, their recipes, and ingredients. Write the DDL statements to create the following tables with the mentioned constraints to handle the data: symbol refers to the primary key NN refers to Not NULLCreate a USERS table with a unique constraint named Users_Email_uk on the Email column.Create an INGREDIENTS table with a unique constraint named unique_ingredient_id on the IngredientID column.Remove the unique constraint named Users_Email_uk from the USERS table as it is no longer required.Add a new unique constraint named Recipes_RecipeName_uk on the RecipeName column in the RECIPES table.Note: The user must write only the query to create and alter the table. The query to display the description of the table is already given.Input format :No console inputOutput format :The output displays the successful table creation status and the structure of all three tablesRefer to the sample output.Sample test cases :Input 1 :Output 1 :Table USERS created.Table RECIPES created.Table INGREDIENTS created.Table USERS altered.Table RECIPES altered. Name Null? Type _ USERID NUMBER USERNAME VARCHAR2(100) EMAIL VARCHAR2(100) Name Null? Type _ _ __ RECIPEID NOT NULL NUMBER USERID NOT NULL NUMBER RECIPENAME VARCHAR2(100) Name Null? Type _ _ ____________ INGREDIENTID NOT NULL NUMBER RECIPEID NOT NULL NUMBER INGREDIENTNAME VARCHAR2(100) TABLE_NAME CONSTRAINT_NAME STATUS INGREDIENTS UNIQUE_INGREDIENT_ID ENABLED RECIPES RECIPES_RECIPENAME_UK ENABLED 2 rows selected.

Question

David is developing a recipe management system for a cooking app. The system tracks users, their recipes, and ingredients. Write the DDL statements to create the following tables with the mentioned constraints to handle the data: symbol refers to the primary key NN refers to Not NULLCreate a USERS table with a unique constraint named Users_Email_uk on the Email column.Create an INGREDIENTS table with a unique constraint named unique_ingredient_id on the IngredientID column.Remove the unique constraint named Users_Email_uk from the USERS table as it is no longer required.Add a new unique constraint named Recipes_RecipeName_uk on the RecipeName column in the RECIPES table.Note: The user must write only the query to create and alter the table. The query to display the description of the table is already given.Input format :No console inputOutput format :The output displays the successful table creation status and the structure of all three tablesRefer to the sample output.Sample test cases :Input 1 :Output 1 :Table USERS created.Table RECIPES created.Table INGREDIENTS created.Table USERS altered.Table RECIPES altered. Name Null? Type ___________ ________ ________________ USERID NUMBER USERNAME VARCHAR2(100) EMAIL VARCHAR2(100) Name Null? Type _____________ ___________ ________________ RECIPEID NOT NULL NUMBER USERID NOT NULL NUMBER RECIPENAME VARCHAR2(100) Name Null? Type _________________ ___________ ________________ INGREDIENTID NOT NULL NUMBER RECIPEID NOT NULL NUMBER INGREDIENTNAME VARCHAR2(100) TABLE_NAME CONSTRAINT_NAME STATUS ______________ ________________________ __________ INGREDIENTS UNIQUE_INGREDIENT_ID ENABLED RECIPES RECIPES_RECIPENAME_UK ENABLED 2 rows selected.

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Solution

Here are the SQL DDL statements to create and alter the tables as per the requirements:

Create USERS table with a unique constraint on the Email column:

CREATE TABLE USERS (
    USERID NUMBER PRIMARY KEY,
    USERNAME VARCHAR2(100) NOT NULL,
    EMAIL VARCHAR2(100) NOT NULL,
    CONSTRAINT Users_Email_uk UNIQUE (EMAIL)
);

Create INGREDIENTS table with a unique constraint on the IngredientID column:

CREATE TABLE INGREDIENTS (
    INGREDIENTID NUMBER PRIMARY KEY,
    RECIPEID NUMBER NOT NULL,
    INGREDIENTNAME VARCHAR2(100) NOT NULL,
    CONSTRAINT unique_ingredient_id UNIQUE (INGREDIENTID)
);

Remove the unique constraint named Users_Email_uk from the USERS table:

ALTER TABLE USERS
DROP CONSTRAINT Users_Email_uk;

Create RECIPES table and add a new unique constraint on the RecipeName column:

CREATE TABLE RECIPES (
    RECIPEID NUMBER PRIMARY KEY,
    USERID NUMBER NOT NULL,
    RECIPENAME VARCHAR2(100) NOT NULL
);

ALTER TABLE RECIPES
ADD CONSTRAINT Recipes_RecipeName_uk UNIQUE (RECIPENAME);

Please note that the actual table creation and alteration status will depend on the execution of these statements in your database environment.

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