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SQL MIN()

SQL MIN()  returns the smallest value of the selected column. Table – Students +—–+——+——-+——-+——-+ | sid | name | mark1 | mark2 | mark3 | +—–+——+——-+——-+——-+ |   1 | AAAA |    30 |    35 |    40 | |...

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SQL SUM()

SQL SUM()  returns the total sum of a numeric column. Table – Students +—–+——+——-+——-+——-+ | sid | name | mark1 | mark2 | mark3 | +—–+——+——-+——-+——-+ |   1 | AAAA |    30 |    35 |    40 | |   2 | BBBB...

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SQL GROUP BY

SQL GROUP BY should be added with all aggregate functions and it s used in conjunction with the aggregate functions to group the result-set by one or more columns. Table – Users +—–+——+ | uid | name |...

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SQL HAVING

SQL HAVING clause is used with aggregate functions. Syntaxt SELECT column_name, aggregate_function(column_name) FROM table_name GROUP BY column_name HAVING aggregate_function(column_name) operator...

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SQL UCASE()

SQL UCASE()  converts the value of a field to uppercase. Syntaxt SELECT UCASE(column_name) FROM table_name Table – Users +—–+——+ | uid | name | +—–+——+ |   1 | aaaa | |   2 | bbbb | |   3 | cccc | |...

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SQL LCASE()

SQL LCASE()  converts the value of a field to lowercase. Syntaxt SELECT LCASE(column_name) FROM table_name Table – Users +——+ | name | +——+ | AAAA | | BBBB | | CCCC | | DDDD | | EEEE | +——+ Example...

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SQL MID()

SQL MID()  is used to extract characters from a text field. Syntaxt SELECT MID(column_name,start,length) FROM table_name Table – Users +—–+——-+ | uid | name  | +—–+——-+ |   1 | name1 | |   2 | name2 |...

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SQL ROUND()

SQL ROUND()  is used to round a numeric field to the number of decimals specified. Syntaxt SELECT ROUND(column_name,decimals) FROM table_name Table – Users +—–+—–+———–+ | oid | uid | price     |...

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Data Definition Statements

SQL Create DB – It is used to create a database SQL Create Table – It is used to create a table. SQL Create Index – It is used to create indexes in tables SQL Drop –  can be used to delete...

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SQL injection

SQL injection is a technique often used to attack databases through a website. This is done by including portions of SQL statements in a web form entry field in an attempt to get the website to pass a...

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