Check out example codes for "select from describe sql". It will help you in understanding the concepts better.
Code Example 1
SELECT COLUMN_NAME AS `Field`, COLUMN_TYPE AS `Type`, IS_NULLABLE AS `NULL`,
COLUMN_KEY AS `Key`, COLUMN_DEFAULT AS `Default`, EXTRA AS `Extra`
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'schemaName' AND TABLE_NAME = 'table1';
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