mysql将null和空字符串转为0
その他
2021-11-20 23:17:34
訪問数: null
方法一:
select IF(ISNULL(columnName) OR columnName='',0,columnName) from tableName;
方法二:
select case when ISNULL(columnName) OR columnName='' then 0 else columnName end from tableName;
注:columnName表示字段名称,tableName表示表名称
転載: blog.csdn.net/shenyipeng9889/article/details/100516571