SQL Aggregate Functions It is often necessary to summarize data for analysis and reporting purposes. Be it determining the number of rows in a table, obtaining the sum of column’s values, or finding the column’s highest, lowest, or average value. Aggregate functions are used for this type of retrieval. Although each DBMS has its own …
SQL LIKE Operator Until now you have been using operators such as conditional operators (for testing equality), BETWEEN operator (for checking against a range of values) or IN operator (for checking against a set of values) in which one thing is common; They all search for an exact match. Filtering data that way is all well and good. But sometimes a …
SQL IN Operator The IN operator allows you to test whether a value falls within a set of values. A set can be a list of literal values, or the result of a subquery. Syntax The IN operator must be followed by a comma-delimited list of valid values enclosed within parentheses. SELECT column_name(s) FROM table_name …
SQL BETWEEN Operator In addition to checking whether an expression is equal to another expression, you can build conditions that check whether an expression falls within a certain range. This type of condition is used when working with numerical or temporal data (data related to date and time), for example, to check for all products …
SQL WHERE Clause Database tables usually contain large amounts of data, and you rarely need to retrieve all the rows in a table. More often than not, you will want to retrieve the subset of the table’s data as needed for specific operations or reports. Retrieving the desired data involves specifying search criteria, also known …
SQL SELECT Statement The SQL statement that you will probably use most often is the SELECT statement. Its purpose is to retrieve data from one or more tables of the database (or even several databases) and display it. The result of a SELECT statement is another table, also known as a result set. Syntax The …
(SQL Example for Citizen Data Scientist & Business Analyst) SQL | Numeric Functions Numeric Functions are used to perform operations on numbers and return numbers. Following are the numeric functions defined in SQL: ABS(): It returns the absolute value of a number. Syntax: SELECT ABS(-243.5); Output: 243.5 SQL> SELECT ABS(-10); +————————————–+ | ABS(10) +————————————–+ | 10 +————————————–+ …
(SQL Example for Citizen Data Scientist & Business Analyst) SQL | Date functions In SQL, dates are complicated for newbies, since while working with database, the format of the date in table must be matched with the input date in order to insert. In various scenarios instead of date, datetime (time is also involved …
(SQL Example for Citizen Data Scientist & Business Analyst) SQL Server Mathematical functions (SQRT, PI, SQUARE, ROUND, CEILING & FLOOR) Mathematical functions are present in SQL server which can be used to perform mathematical calculations. Some commonly used mathematical functions are given below: 1. SQRT(): SQRT() function is the most commonly used function. It …
(SQL Example for Citizen Data Scientist & Business Analyst) SQL | Join (Inner, Left, Right and Full Joins) A SQL Join statement is used to combine data or rows from two or more tables based on a common field between them. Different types of Joins are: INNER JOIN LEFT JOIN RIGHT JOIN FULL JOIN …