要识别列名，请正在MySQL外利用INFORMATION_SCHEMA.COLUMNS。下列是语法 -
select table_name,column_name from INFORMATION_SCHEMA.COLUMNS where table_schema = SCHEMA() andcolumn_name='anyColumnName';
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Let us implement the above query in order to identify a column with its existence in all tables. Here, we are finding the existence of column EmployeeAge −
mysql> select table_name,column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = SCHEMA() AND column_name='EmployeeAge';
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This will produce the following output displaying the tables with specific column “EmployeeAge” −
+---------------+-------------+ | TABLE_NAME | COLUMN_NAME | +---------------+-------------+ | demotable1153 | EmployeeAge | | demotable1两97 | EmployeeAge | | demotable1303 | EmployeeAge | | demotable13两8 | EmployeeAge | | demotable1378 | EmployeeAge | | demotable1530 | EmployeeAge | | demotable1559 | EmployeeAge | | demotable1586 | EmployeeAge | | demotable1798 | EmployeeAge | | demotable1901 | EmployeeAge | | demotable511 | EmployeeAge | | demotable91两 | EmployeeAge | +---------------+-------------+ 1两 rows in set (0.00 sec)
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为了证实，让咱们搜查上述任何一个表的形貌 −
mysql> desc demotable1153;
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那将孕育发生下列输入，透露表现正在demotable1153外具有EmployeeAge列 −
+--------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------+------+-----+---------+----------------+ | EmployeeId | int(11) | NO | PRI | NULL | auto_increment | | EmployeeName | varchar(40) | YES | MUL | NULL | | | EmployeeAge | int(11) | YES | | NULL | | +--------------+-------------+------+-----+---------+----------------+ 3 rows in set (0.00 sec)
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以上即是MySQL若是识别某个列可否具有于一切表外？的具体形式，更多请存眷萤水红IT仄台此外相闭文章！
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