Creating MAP from SOQL Query

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Please use below syntax to get Map from SOQL.

Map<ID, Contact> contactIdMap= new Map<ID, Contact>([SELECT Id, LastName FROM Contact]);

Returns a set that contains all the keys in the map.
Set <Id> listOfIds = contactIdMap.ketSet();

Returns a list that contains all the values in the map.
List<Contact> contactList = contactIdMap.Values();

I hope this will help you.

Reference URL
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_map_sobject.htm
Have almost 7 years of experience and expertise in Core Java, JDBC, Servlet, JSP, Java Web Services and Struts, Oracle Database, MS SQL Server,Apex,Visual Force,Force.com platform. Good Experience on Oracle CRM ON DEMAND, Sales force CRM with ability to work independently and in a team environment. Good Analytical & Reasoning skills. Strongly creative in learning new technologies and systems, extremely passionate to work in a challenging place. Apart from that, I have very vast experience in integration and data migration from one system to other system. Certifications: 1. Salesforce Certified Platform Developer I 2. Salesforce Certified Administrator 3. Salesforce Certified Sales Cloud Consultant 4. Salesforce Certified Service Cloud Consultant 5. Oracle Certified Java Developer 6.Oracle Certified Web Component Developer 7. Oracle Certified SQL Associate

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