D427 - Database Management Applications Exam 2024

Schema The definition of how data in a database will be organized. - Create - Read - Update - Delete The basis of interacting with databases can be defined using the CRUD acronym. What does CRUD stand for? DATE: YYYY-MM-DD DATETIME: YYYY-MM-DD HH:MM:SS What is the DATE datatype syntax? What is the DATETIME datatype syntax? It will have 3 numbers before the decimal and 2 after. What does DECIMAL(3,2) indicate? Stored Procedures a series of commands stored on the database. This allows the reuse of long or detailed queries instead of writing them for each use. It also provides a safe way to deal with sensitive data, especially with those unfamiliar with SQL syntax. Data definition language (DDL) involves instructing the DBMS software on what tables will be in the database, what attributes will be in the tables, which attributes will be indexed, and so forth. data manipulation languages (DMLs) refers to the four basic operations that can and must be performed on data stored in any DBMS (or in any other data storage arrangement, for that matter): data retrieval, data update, insertion of new records, and deletion of existing records. SELECT * FROM CUSTOMER WHERE CUSTNUMB BETWEEN 1 AND 2; What would the SELECT statement look like if you use a BETWEEN. SELECT * FROM CUSTOMER WHERE HQCITY IN ('Atlanta', 'Chicago', 'Washington'); What would the SELECT statement look like if you use a IN. SELECT * FROM CUSTOMER WHERE HQCITY LIKE 'W%'; What would the SELECT statement look like if you use a LIKE. A% - The "%" means that any string of characters can follow afterwards. The percent sign represents zero or more arbitrary regular characters A_ - The _ means that there will be exactly one letter following the A. The underscore represents a single arbitrary regular character. What are the two ways of using the LIKE command? The clause can include the term ASC at the end to make ascending explicit or it can include DESC for descending order. The default order for ORDER BY is ascending. How can you make it descending order? SELECT AVG/SUM/MIN/MAX/COUNT(Column_Name) FROM SALES WHERE Name = 'Matt'; Command to use AVG/SUM/MIN/MAX/COUNT aggregate functions? o One is that the tables to be joined must be listed in the FROM clause. o Two is that the join attributes in the tables being joined must be declared and matched to each other in the WHERE clause. There are two specifications to make in the SELECT statement to make a join work. SELECT SPNAME FROM SALESPERSON, CUSTOMER WHERE SALESPERSON.SPNUM=CUSTOMER.SPNUM Example of JOIN CAUSE. Dr. CODD In 1970, Dr. _________ of IBM published in Communications of the ACM a paper entitled "A Relational Model of Data for Large Shared Data Banks." This paper marked the beginning of the field of relational databases. CREATE TABLE DROP TABLE Commands to create and drop a table? - When you create the column definition (known as a column constraint). - When you use the CONSTRAINT keyword (known as a table constraint). The CREATE TABLE command lets you define constraints in two different places: NOT WHERE Location NOT IN ('WV', TN' 'CA'); WHERE Total NOT Between '1000', 2000'; WHERE Name NOT LIKE 'Ma%'; You can exclude rows with other types of conditions by using the ______ operator. USE USE MainDatabase The _____ command tells the database system which database you're going to be using for the upcoming commands. SHOW SHOW DATABASES - lists all databases in the database system instance. SHOW TABLES - lists all tables in the default database. SHOW COLUMNS FROM TableName - lists all columns in the TableName table of the default database. SHOW CREATE TABLE TableName - shows the CREATE TABLE statement for the TableName table of the default database.