我希望从表格中计算正则表达式实例的数量。例如:
message state ================================ [foo] aaaa active [bar] aaaa idle [foo] bbbb idle [foo] cccc active [bar] dddd active [tar] eeee idle我想要的结果如下:
messageType ocurrences ==================================== [foo] 3 [bar] 2 [tar] 1有没有办法做到这一点?任何帮助都将不胜感激!
SELECT COUNT(*) FROM table1 WHERE messageType ~ '[[]foo[]]';
- Wiktor Stribiżew