Excel formulas
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The document describes various Excel formulas for performing basic math functions like addition, subtraction, multiplication, and division. It also covers formulas for calculating averages, maximums, minimums, and medians of cell ranges. Additionally, it summarizes formulas for formatting text, using conditional statements, referencing cells, extracting parts of text, combining values, and working with dates. Examples are provided for each type of formula.
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Joins in SQL
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Joins in databases combine records from two or more tables. The main types of joins are natural joins, equijoins, self joins, and outer joins. Natural joins automatically match columns with the same name, while equijoins use equality comparisons in the WHERE clause. Self joins match a table to itself, and outer joins return all records from one or both tables even if there are no matches.
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The document discusses different types of SQL joins, including inner joins, outer joins, equi joins, non-equi joins, natural joins, cross joins, left joins, right joins, full outer joins, and self joins. It provides the syntax and examples for each type of join. It also discusses joining tables through referential integrity, where a foreign key references a primary key in another table to link the tables together.
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The document discusses key aspects of spreadsheets including their purpose for calculations and data organization, basic components like rows, columns and cells, simple formulas for addition, subtraction, multiplication and division, functions like SUM, AVERAGE, MAX and MIN, using IF statements to make choices based on cell values, absolute and relative replication of formulas, and charting data visually with graphs.
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MySQL MIN Function - The MySQL MIN aggregate function allows us to select the lowest (minimum) value for a certain column.
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MySQL SUM Function - The MySQL SUM aggregate function allows selecting the total for a numeric column.
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The document discusses different types of joins in database systems. It defines natural join, inner join, equi join, theta join, semi join, anti join, cross join, outer join including left, right and full outer joins, and self join. Examples are provided for each type of join to illustrate how they work.
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This document discusses inverse functions. It provides examples of functions and their inverses, including:
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This document discusses inverse functions. It provides examples of functions and their inverses, including:
- A function f(x) = {(1, 4), (2, 6), (5, 3)} and its inverse f-1(x) = {(4, 1), (6, 2), (3, 5)}.
- Showing that composing a function with its inverse results in the identity function: f-1(f(x)) = x and f(f-1(x)) = x.
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Here is the list of all important MySQL functions. Each function has been explained along with suitable example.
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MySQL Group By Clause - The MySQL GROUP BY statement is used along with the SQL aggregate functions like SUM to provide means of grouping the result dataset by certain database table column(s).
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MySQL IN Clause - This is a clause which can be used alongwith any MySQL query to specify a condition.
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MySQL BETWEEN Clause - This is a clause which can be used alongwith any MySQL query to specify a condition.
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MySQL UNION Keyword - Use a UNION operation to combine multiple result sets into one.
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MySQL COUNT Function - The MySQL COUNT aggregate function is used to count the number of rows in a database table.
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MySQL MAX Function - The MySQL MAX aggregate function allows us to select the highest (maximum) value for a certain column.
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MySQL MIN Function - The MySQL MIN aggregate function allows us to select the lowest (minimum) value for a certain column.
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MySQL AVG Function - The MySQL AVG aggregate function selects the average value for certain table column.
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MySQL SUM Function - The MySQL SUM aggregate function allows selecting the total for a numeric column.
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MySQL SQRT Functions - This is used to generate a square root of a given number.
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