可以找到mysql數據庫表中的列數？

Question

是否可以找到mysql數據庫表中的列數？

SELECT COUNT(COLUMNS) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE table_schema = 'database_name' 
AND table_name = 'tbl_name' 

Answer 1

SELECT COUNT(*) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE table_schema = 'database_name' 
AND table_name = 'tbl_name' 

從這裏：Find the number of columns in a table

Answer 2

建議你看看到數據庫信息架構表的結構... https://dev.mysql.com/doc/refman/5.5/en/columns-table.html

SELECT COUNT(column.name) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE table_schema = 'database_name' 
AND table_name = 'tbl_name';