Updating multiple columns in oracle

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Read an example of an SQL case expression from our SQL expert Rudy Limeback.

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UPDATE summary_data SET current_category = (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id) WHERE EXISTS (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id); If you want to test your skills using the SQL UPDATE statement, try some of our practice exercises.

if i know the email_id field is populated on some records but not on others, i can limit the update to just those rows as follows UPDATE PERSONS P SET (jobtitle, last_name, first_name, dblogin_id, email_Id, userlevel, facility_id, supervisor, department, winloginid) = (select jobtitle, last_name, first_name, dblogin_id, email_Id, userlevel, facility_id, supervisor, department, winloginid from TEMP_ECOLAB_PERSONS TE where TE.

Suppose I have table A and B and having four columns each table A(col1,col2,col3,col4) B(col1,col2,col3,col4) then how should i do something like this update A set(col2,col4)=(select B.col2, B.col4 from B where B.col1=A.col1 and A.col3=A.col3) Please help..........Do all of you have a copy of your SQL Reference manual?Every major database system, whether proprietary or open source, has a manual which you can browse for free on the Web.For example, we discover that we need to keep a record of the last date that each author published and what they published.We need to add two columns to the author table, Notice that the new columns are at the end of the AUTHOR table.

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