MySQL获取两段落标签之间的文本子串

Question

我需要获取一行记录的第一段。我怎样才能通过查询来做到这一点

Answer 1

这是一个演示，使用SUBSTRING_INDEX()函数返回文本块的第一段，假定段落由换行符分隔。

mysql> create table t (t text); 

mysql> insert into t (t) values ('now is the time\nfor all good men'); 

mysql> select * from t; 
+----------------------------------+ 
| t        | 
+----------------------------------+ 
| now is the time 
for all good men | 
+----------------------------------+ 

mysql> select substring_index(t, '\n', 1) from t; 
+-----------------------------+ 
| substring_index(t, '\n', 1) | 
+-----------------------------+ 
| now is the time    | 
+-----------------------------+