mysql - Truncated incorrect DOUBLE value: 'undefined'
mysql - Truncated incorrect DOUBLE value: 'undefined'
我是怎么遇到这个问题的?
我要从多个表里,查询统计数据,保存到统计表里,需要执行下面这种结构的 sql 语句:
insert into table1 select (select count(*) from t1 where ...) c1, select (select count(*) from t1 where ...) c1
单独执行 select (select count(*) from t1 where ...) c1, select (select count(*) from t1 where ...) c1 没有问题
合在一起执行就会出现 Truncated incorrect DOUBLE value: 'undefined'
最后发现原因,是因为:
子语句 select count(*) from t1 where ... 的 where 条件里,有个 where lat != 0
而 t1 表里,lat 保存的是 varchar 格式,当 lat 有转不了 DOUBLE 的值时,就会报错:Truncated incorrect DOUBLE value: 'undefined'
解决方式:
将 where lat != 0 改成 where lat != '0'
至于为什么单独执行 select (select count(*) from t1 where ...) c1, select (select count(*) from t1 where ...) c1 却不报错,就不知道为什么了
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