title: Copy data from one column to another from different tables in sqlite
body: <p>I want to copy data to column A in Table1 from column B in Table2. Rows for column A are empty and there are exists other columns in Table1 with already populated data. So I need to grab the whole column B from Table2 and insert all those values in column A in Table1. The two table are completely identical, except that column A has no values at all.</p>
  
  <p>How do I do this in sqlite3? </p>