匿名通过本文主要向大家介绍了MySQL,判断,字符串,是否是,数字,查询表,table,等相关知识,希望本文的分享对您有所帮助
查询表table_name中col_name（字符串类型）的值是数字的记录 SELECT col_name,CAST(col_name AS UNSIGNED INTEGER) AS val FROM table_name WHERE col_name=0 OR col_name0 HAVING CHAR_LENGTH(col_name)=CHAR_LENGTH(val);
查询表table_name中col_name（字符串类型）的值是数字的记录SELECT col_name,CAST(col_name AS UNSIGNED INTEGER) AS val
FROM table_name
WHERE col_name="0" OR col_name>0
HAVING CHAR_LENGTH(col_name)=CHAR_LENGTH(val);