Oracle Database Installation in Windows
STEP 1: Download Oracle Database Express Edition (XE) Release
11.2.0.2.0 (11gR2).
Click Download link
Accept agreement and Click Download button
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After sign in .It will be download automatically.
Watch this Video to Download Oracle Database in windows
Watch this Video to install Oracle Database in windows
STEP 3: Create Database and Run PL/SQL Program in Oracle DataBase
Watch this Video to Create Database and Run PL/SQL Program in Oracle
Database
More topic in PL/SQL