Mysql count
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MySQL COUNT() function returns a count of number of non-NULL values of a given expression. If it does not find any matching row, it returns 0.
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The document discusses the if-else conditional statement in C programming. It provides the syntax and examples of using if-else statements to execute code conditionally based on whether an expression is true or false. This includes if-then statements with and without else blocks, multiway if-else statements, nested if statements, and examples checking the equality of variables and ranges of values.SQL UNION
SQL UNIONRitwik Das
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The SQL UNION operator combines the results of two or more queries into a single result set. By default, UNION eliminates duplicate rows but UNION ALL includes duplicate rows. For UNION, the number and order of columns must match between queries and column data types must be compatible. Usually the column names from the first query are used. Examples demonstrate UNION, UNION ALL, and combining queries on the same table or with joins between tables.Concat presentation
Concat presentationRitwik Das
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The MySQL CONCAT() function concatenates two or more strings by adding them together and returning the concatenated string. It will return a non-binary string if all arguments are non-binary, and a binary string if any argument is binary. Numeric arguments are also converted to their binary string equivalent. The CONCAT() function takes two or more string arguments and returns their concatenated value.Learning java
Learning javaRitwik Das
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This document outlines the key topics one needs to learn to become proficient in Java programming. It discusses setting up the development environment, object-oriented programming concepts like inheritance and polymorphism, operators, flow control, exceptions handling, strings, file I/O, collections, threads, and miscellaneous utilities like dates and numbers. Mastering these fundamental Java concepts is essential for anyone looking to learn Java.Php variables
Php variablesRitwik Das
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This presentation shows fundamentals of PHP
Variables - declaring variables, Variable scope
Static Variable and Reserved words. Mysql count
- 1. MySql COUNT() function Ref: w3resource MySQL Tutorial
- 2. MySQL Count function MySQL COUNT() function returns a count of numberof non-NULL values of a given expression. If it does not find any matching row, it returns 0. Here is the Syntax: COUNT(expr); We will see different types of usage of MySQL Count function in a moment.
- 3. MySQL Count function Table for demonstration:
- 4. MySQL Count function To return the number of rows in author table: SELECT COUNT(*) FROM author; MySQL COUNT() with logical operator: SELECT country,pub_city,COUNT(*) FROM publisher WHERE country='USA' OR country='UK' GROUP BY country,pub_city;
- 5. MySQL Count function MySQL COUNT() using multiple tables: Table book_mast
- 6. MySQL Count function MySQL COUNT() using multiple tables: Table book_mast
- 7. MySQL Count function SELECT publisher.pub_name,COUNT(*) FROM publisher,book_mast WHERE publisher.pub_id=book_mast.pub_id GROUP BY publisher.pub_id; MySQL COUNT() function with GROUP BY SELECT country,COUNT(*) FROM author GROUP BY country; MySQL COUNT() function with group by on multiple columns SELECT country,pub_city,COUNT(*) FROM publisher GROUP BY country,pub_city;
- 8. MySQL Count function MySQL COUNT() function with distinct SELECT cate_id,COUNT(DISTINCT(pub_lang)), ROUND(AVG(no_page),2) FROM book_mast GROUP BY cate_id;