Sql

SQL-Create tableCreate table table_name(column_name1 datatype, column_name2 datatype……)Eg:create table example (id int ,name varchar(10),address varchar(10))Msg:Command(s) completed successfully.

SQL-Insert ValuesInsert into table_name(column1,column2,…..)values(values1,values2,…)Eg:insert into example (id,name,address) values(123,'xxxx','yyyyy')Msg:(1 row(s) affected)

SQL-Select Commandselect *from exampleId name address123 xxxxyyyyy456 jjjjrrrr456 iiiinnnn567 eeeeffff

SQL-Alter CommandAlter table table_name add or drop column_namedatatypeEg: alter table example add mobilenointMsg: Command(s) completed successfully.Id name address mobileno123 xxxxyyyyy NULL456 jjjjrrrr NULL888 iiiinnnn NULL567 eeeeffff NULL

SQL-Update CommandUpdate table_name set column_name=new value where column_name=any valueEg: Update example set id=888 where name='iiii‘Msg: (1 row(s) affected)Id name address123 xxxxyyyyy456 jjjjrrrr888 iiiinnnn567 eeeeffff

SQL-Delete CommandDelete table_name where conditionEg: delete example where id=888Msg: (1 row(s) affected)Id name address mobileno123 xxxxyyyyy NULL456 jjjjrrrr NULL567 eeeeffff NULL

SQL-Drop CommandDrop table table_nameEg: drop table exampleMsg:Command(s) completed successfully.

SQL-Primary Key & Foreign Key CREATE TABLE table_name (column1 datatype null/not null, column2 datatype null/not null,...CONSTRAINT constraint_namePRIMARY KEY (column1, column2, . column_n));CREATE TABLE table_name (column1 datatype, column2 datatype, column3 datatype, Primary Key (column_any), Foreign Key (Column_any) references Table_any(datatype));

SQL-Primary Key & foreign Keycreate table example (id intprimary key,namevarchar(10),address varchar(10))A primary key is used to unique and Not Null identify each row in the table.create table example2 (salary int,expamountint, id int references example(id))A foreign key is a referential constraint between two tables.

SQL-Primary Key & Foreign Key Id name address 123 rrrrtttt369 klkliooo456 iiiihhhh7889 wswswewwSalary expamount id10000 4235 788912369 8526 45612369 865 45665894 12589 123Example (primary Key tale)Example2 (Foreign Key tale)

SQL-DISTINCTselect distinct address from exaddressioioklkkyuyu

SQL-Primary Key & Foreign Key select name,address,salary from example e,example2 e2 where e.id=e2.idO/PName address salarywswsweww 10000iiiihhhh 12369iiiihhhh 12369rrrrtttt 65894

SQL-BETWEEN & COUNTSELECT "column_name“ FROM "table_name"WHERE "column_name" BETWEEN 'value1' AND 'value2‘select id from ex where id between 100 and 500ID123456SELECT COUNT("column_name") FROM "table_name“select count(id)'No Of Records' from exNo Of Records4

SQL-Connection Stringstring strcon = "Data Source=172.16.0.1;Initial Catalog=BatchThree;User ID=magnum;Password=Magnum";SqlConnectionsqlcon = new SqlConnection(strcon);sqlcon.Open();stringstrsql = "insert into datab values ('" + txtmarks1.Text + "','" + txtmarks2.Text + "','" + txtmarks3.Text + "','" + txtname.Text + "')";SqlCommandcmd = new SqlCommand(strsql, sqlcon);cmd.CommandType = CommandType.Text;cmd.ExecuteNonQuery();sqlcon.Close();

SQL-Stored Procedurecreate procedure proexample(@id int,@namevarchar(10),@address varchar(10)) as insert into example(id,name,address) values (@id,@name,@address)Command(s) completed successfully.exec proexample 666,'hghg','yuyu’(1 row(s) affected)

SQL-Stored Procedureselect *from exampleId name address123 rrrrtttt369 klkliooo456 iiiihhhh666 hghgyuyu7889 wswsweww

SQL-JOINSSQL joins are used to query data from two or more tables, based on a relationship between certain columns in these tablesInner JoinLeft JoinRight JoinFull Join

SQL-INNER JOINThe INNER JOIN keyword return rows when there is at least one match in both tables.SELECT column_name(s)FROM table_name1INNER JOIN table_name2ON table_name1.column_name=table_name2.column_name

SQL-INNER JOINselect name,address,salary from example inner join example2 on example.id=example2.id order by nameName address salaryiiiihhhh 12369iiiihhhh 12369rrrrtttt 65894Wswsweww 10000

SQL-LEFT JOINThe LEFT JOIN keyword returns all rows from the left table (table_name1), even if there are no matches in the right table (table_name2)SELECT column_name(s)FROM table_name1LEFT JOIN table_name2ON table_name1.column_name=table_name2.column_name

SQL_LEFT JOINselect name,address,salary from example left join example2 on example.id=example2.id order by nameName address salaryhghgyuyu NULLiiiihhhh 12369iiiihhhh 12369klkliooo NULLrrrrtttt 65894wswsweww 10000

SQL-RIGHT JOINThe RIGHT JOIN keyword returns all the rows from the right table (table_name2), even if there are no matches in the left table (table_name1)SELECT column_name(s)FROM table_name1RIGHT JOIN table_name2ON table_name1.column_name=table_name2.column_name

SQL_RIGHT JOINselect name,address,salary from example right join example2 on example.id=example2.id order by nameName address salaryiiiihhhh 12369iiiihhhh 12369rrrrtttt 65894wswsweww 10000

SQL-FULL JOINThe FULL JOIN keyword return rows when there is a match in one of the tables.SELECT column_name(s)FROM table_name1FULL JOIN table_name2ON table_name1.column_name=table_name2.column_name

SQL-FULL JOINselect name,address,salary from example full join example2 on example.id=example2.id order by nameName address salaryhghgyuyu NULLiiiihhhh 12369iiiihhhh 12369klkliooo NULLrrrrtttt 65894wswsweww 10000

SQL-VIEWviews can be considered as virtual tables and it physically stores the data. A view also has a set of definitions,and it does not physically store the data.The syntax for creating a view is as follows: CREATE VIEW "VIEW_NAME" AS "SQL Statement"

SQL-VIEWcreate view vex as select *from exselect *from vexid name address123 pop yuyu456 huh ioioexareredrop view vex

SQL-DISTINCTThe SELECT UNIQUE term is an Oracle-only SQL statement. It is equivalent to SELECT DISTINCT. SyntaX:SELECT DISTINCT "column_name"FROM "table_name“Eg: select *from exId name address123 pop yuyu456 huh ioio856 exaklkk856 exaklkk

SQL-IN & LIKESELECT "column_name“ FROM "table_name"WHERE "column_name" IN ('value1', 'value2', ...)select name,address from ex where id in(456)name addresshuh ioioSELECT "column_name“ FROM "table_name"WHERE "column_name" LIKE {PATTERN}select name,address from ex where id like(456)name addressHuh ioio

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