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Rational Number or Rational Mothod in ruby or Rational operation Rational Number is always comes with paired integer Number(1 ,2 ,3 .... && -1, -2, .....) x/y (where y>0). Rational (1) => (1/1) Rational (2, 5) =>(2/5) Rational(4, -8) => (-1/2) 5.to_r =>(5/1) 2/3r => (2/3) Rational into Numeric rational*numeric -> numeric (perfoms multiplecation) Rational(1, 3)  * Rational(2, 3)   => (2/9) Rational(200)   * Rational(1)      => (200/1) Rational(-5, 4) * Rational(-4, 5)  => (1/1) Rational(9, 4)  * 4                => (9/1) Rational(20, 9) * 9.8              => 21.77777777777778 rat ** numeric => numeric (Performs exponentiation) Rational(3)    ** Rational(3)    => (27/1) Rational(10)   ** -2             => (1/100) Rational(10)   ** -2.0           => 0.01 Rational(-4)   ** Rational(1,2)  => (1.2246063538223773e-16+2.0i) Rational(1, 2) ** 0              => (1/1) Rational(2,

Types of SQL commands 1) DDL(data definition language) commands:       Used to create or change or delete any data base objects CREATE ALTER DROP TRUNCATE RENAME 2) DML(data manipulation language) COMMANDS       Used to fetch data / enter new data/ changing existed data / deleting the data from table. INSERT  UPDATE  DELETE  TRUNCATE 3) DRL(dataretrieval language) Command     SELECT (logicalcommand) 4) DCL(DATA CONTROL LANGUAGE) COMMANDS     Used to control the access of data base objects. These commands are used by DBA (databaseadministrator) GRANT  REVOKE 5) TCL(TRANSACTION CONTROL LANGUAGE) COMMANDS      Used to save or cancel the actions/transactions made on table data. COMMIT  ROLLBACK  SAVEPOINT

Angular Js  form validation   1-Create a Form                   <form name="userForm" novalidate > 2-Add Bootstrap Class for Showing Error Messages to that Div              <div class="form-group"  ng-class="  {'has-error':! userForm.email.$valid &&(!userForm.$pristine || userForm.$submitted),  'has-success':userForm.email.$valid && (!userForm.$pristine || userForm.$submitted)       }       "> replace userForm with your form name. 3-Now Add the input field into your form                 <input type="email"  name="email"  class="form-control"  ng-model="main.email"                            ng-minlength="5"  ng-maxlength="20"  required="required"> here we are adding required  validation. minimum length 5 validation . maximum length 20 validation. 4-Now Finally we add validation one by one 1-when fo

AngularJs form validation || client side validation by angular js 1-Create a Form                   <form name="userForm" novalidate > 2-Add Bootstrap Class for Showing Error Messages to that Div              <div class="form-group"  ng-class="  {'has-error':! userForm.email.$valid &&(!userForm.$pristine || userForm.$submitted),  'has-success':userForm.email.$valid && (!userForm.$pristine || userForm.$submitted)       }       "> replace userForm with your form name. 3-Now Add the input field into your form                 <input type="email"  name="email"  class="form-control"  ng-model="main.email"                            ng-minlength="5"  ng-maxlength="20"  required="required"> here we are adding required  validation. minimum length 5 validation . maximum length 20 validation. 4-Now Finally we