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Author: Unique982

SELECT ALL Particular Column Records in SQL.txt

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+// select
+The SELECT statement is used to select data from a database and retrieve the information.
+1. SELECT ALL Columns from the table_name;
+Syntax: SELECT * FROM tbale_name;
+ex:select * from student_reg;
++------+---------+---------+------------+-----------+
+| s_id | name    | address | dob        | fees      |
++------+---------+---------+------------+-----------+
+|  101 | RAM     | KTM     | 1998-12-15 |   1000.23 |
+|  102 | SITA    | KTM     | 2001-10-11 | 200000.12 |
+|  103 | HARI    | PKR     | 2001-01-12 |  10000.52 |
+|  104 | BIMAl   | KTM     | NULL       |   1001.23 |
+|  105 | KAMAL   | PKR     | 1956-12-12 | 100000.12 |
+|  106 | SITA KC | PKR     | 1998-02-02 |  20000.12 |
++------+---------+---------+------------+-----------+
+2. Select Particular columns from the table
+Syntax: select column_name1,column_name2... from table;
+ex: select name,dob from student_reg;
++---------+------------+
+| name    | dob        |
++---------+------------+
+| RAM     | 1998-12-15 |
+| SITA    | 2001-10-11 |
+| HARI    | 2001-01-12 |
+| BIMAl   | NULL       |
+| KAMAL   | 1956-12-12 |
+| SITA KC | 1998-02-02 |
++---------+------------+

SELECT with LIMIT in SQL.txt

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+//SELECT with LIMIT in SQL
+SELECT LIMIT is used to specify some number of records to display
+syntax: SELECT column_name1,column_name2 From table_name LIMIT recorde_number;
+ex: SELECT * FROM student_reg LIMIT 4;
++------+-------+---------+------------+-----------+
+| s_id | name  | address | dob        | fees      |
++------+-------+---------+------------+-----------+
+|  101 | RAM   | KTM     | 1998-12-15 |   1000.23 |
+|  102 | SITA  | KTM     | 2001-10-11 | 200000.12 |
+|  103 | HARI  | PKR     | 2001-01-12 |  10000.52 |
+|  104 | BIMAl | KTM     | NULL       |   1001.23 |
++------+-------+---------+------------+-----------+

Single Quotes problem in SQL.txt

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+//Single Quotes problem in SQL
+INSERT INTO table_name(id,c_name,address) VALUES(1,'un'i testing','np');
+There are two  way to solve this problem
+1.-> Use backslash
+ex:'un'\i testing'
+2.-> Use two time single Quotes
+ex: 'un''i testing'
+
+ex: insert into student (name,roll,address)VALUES('U\'I Testing',101,'Ktm
+');
+OutPut:
+select * from student;
++-------------+------+---------+
+| name        | roll | address |
++-------------+------+---------+
+| U'I Testing |  101 | Ktm     |
++-------------+------+---------+

WHERE Clause and equal operator.txt

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+// WHERE
+-> is used to search for a specific data;
+1. Specifi data from all column
+Syntax: SELECT * FROM table_name WHERE column_name operators 'value';
+ex: SELECT * FROM student_reg WHERE s_id='102';
++------+------+---------+------------+-----------+
+| s_id | name | address | dob        | fees      |
++------+------+---------+------------+-----------+
+|  102 | SITA | KTM     | 2001-10-11 | 200000.12 |
++------+------+---------+------------+-----------+
+Note: Value can be text or numeric. if it is text then we have to put single quotes.
+
+
+SQL Comparison Operators
+Operator 	Description 	Example
+= 	Equal to 	
+> 	Greater than 	
+< 	Less than 	
+>= 	Greater than or equal to 	
+<= 	Less than or equal to 	
+<> 	Not equal to 
+<> or != Not equal
+BETWEEN  Between an inclusive range
+LIKE search for a pattern
+In To specifY MULTIPLE POSSIBLE VALUE OF A COLUMN	
+
+2. specific data from specific column
+Syntax: SELECT column_name From table_name WHERE column_name operator 'value';