//Modify the type of field.

Alter table user modifies new1varchar (10);

//Modify the name of the field. In this case, you must specify the type of field again.

Alter table user changes new 1 new4 int.

First, the computer frequently asked questions

The motherboard doesn't start, it doesn't display when it starts, and the graphics card has an alarm sound.

Cause of failure: Generally, the graphics card is loose or damaged.

Solution: Open the chassis and plug in the graphics card. Check the AGP slot for small foreign objects, otherwise the graphics card will not be inserted in place; For the motherboard using voice alarm, carefully identify the content of voice prompt, and then solve the corresponding fault according to the content.

If you report to the police after handling the above measures, the chip of the graphics card may be broken. Replace or repair the video card. If you hear a beep after turning on the computer, the display is normal but there is no image. The graphics card works normally when plugged into other motherboards, that is, the graphics card is incompatible with the motherboards, so the graphics card should be replaced. ?