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DML Command Insert Command Its used to insert the record into table example- Command for inserting single record insert into <table name> values(value1, value2...) Command for inserting multiple command at a time insert into <table name> values(&col1, &col2...., &coln); whenever you enter query like this it will ask you to like this - enter a value for column1- value1.. and then hit enter  - enter a value for column2- value2.. and then hit enter - enter a value for column3- value3.. and then hit enter Now it will show 1 row created  if you want to create more record use / and hit enter SQL> /   hit enter // it will Execute most recent query again //this will so again and so on... - enter a value for column1- value1..  and then hit enter  - enter a value for column2- value2..  and then hit enter - enter a value for column3- value3..  and then hit enter // if you will miss any value here that will be inserted as NULL value Update command Used to upda

DDL Command CREATE Command It is used to create any data base object like tables, views, indexes, sequences, synonyms , users, functions, procedures, triggers, packages and so on. HOW TO CREATE A TABLE?            syn: CREATE TABLE <table_name>             (              <colname1> DATATYPE (size),               <colname2> DATATYPE (size),                : : : :,                : : : :,             ); INSERT Command This command is used for inserting new records into the tables          Syntax:           INSERT INTO <table_name>[(col1, col2,...., col n)]           VALUES(val1, val2,.....,val n);                  NOTE:  i) If number of columns in the table and number of values inserting in to the table      are equal, then no need to specify column names while inserting records.            ii) Char, Varchar2 and date type values should be enclosed in Single Quotes.            iii) If Number of inserting values are less than the

Give mode in webpack.config.js            mode: "development || production"  //whatever you want to give Use it before Entry module.exports = {   mode: "development",    entry: './src/main.js', // Bundle all assets from this location together    output: {        filename: 'index.js', // Output to this file        path: path.resolve( __dirname, 'public' ), // In this location    }, 

First install node and check node -v and npm -v Create a directory mkdir <your_directory_name> Run command npm init (press enter and use all defaults) by this command package.json file will be created in root directory for creating Dependency we run this command npm install --save-dev babel-cli babel-preset-react npm install --save-dev babel-cli babel-preset-env sudo npm install -g  babel-cli babel-preset-env babel-preset-react ( Installed "babel-cli@6.26.0" with binaries:  - babel-doctor  - babel - babel-node  - babel-external-helpers ) this packages are created. Install live server npm  install  -g  live - server Now again make a directory inside root directory mkdir public (you can take name as you want) mkdir src (you can take name what ever you want you want) inside public folder create two new file index.html index.js inside src folder create one new file  main.js ( this is file where react app execution is start. you can take