You can change the data type of any column if all rows of the column contain nulls. However, if you change the data type of a column in a materialized view container table, then Oracle Database invalidates the corresponding materialized view.
US Economy. Definition: A stock market crash is when stock indexes lose more than 10% in a day or two. The broad indexes are the Dow Jones Industrial Average, the S&P 500, and the NASDAQ. The rapidity of the decline differentiates it from a stock market correction. That's a 10% loss over days, weeks or even months.
Best Answer: Before the Great Crash of 1929, there was little support for federal regulation of the securities markets. When the stock market crashed in October 1929, public confidence in the markets plummeted. There was a consensus that for the economy to recover, the public's faith in the capital markets needed to be restored.