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.
After-hours trading (AHT) refers to the buying and selling of securities on major exchanges after the specified regular trading hours. Both the New York Stock Exchange and the Nasdaq National Market operate regularly from 9:30 a.m. to 4:00 p.m. ET.