如何檢查Mysql行中的文本？

Question

我正在嘗試檢查表中的行是否包含特定的字符串。 如果是這樣，我想獲取具有特定字符串的用戶。 我的桌子看起來像這樣： 圖片

我想檢查“地址”列/行中的字符串“ Peter”。 我如何瀏覽並找到它？ 然后，這樣做之后，我將如何檢查擁有字符串的用戶的ID？ 感謝您能提供的任何幫助。

Answer 1

mysql的基礎知識。 通配符%告訴db引擎，我們期望在'Peter'字符串之前和之后的一些字符。

SELECT * FROM tablename WHERE Address LIKE '%Peter%'

火柴：

"Peter's address"
"It is Peter's address"
"Address of Peter"

Answer 2

編寫SQL命令以掃描數據。針對您的問題的命令看起來像::

select * from Mytable where address="peter";

Answer 3

給定LIKE的一些替代方案

MariaDB [BANK]> select * from customer;
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
| id   | version | title | FirstName | Middlenames | LastName | Gender | Dob        | Dod  | Warning_flag | Worth |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
|    1 |    1.00 | Mr    | fname1    | NULL        | lname1   | m      | 1990-01-01 | NULL | NULL         | NULL  |
|    2 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
|    3 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
3 rows in set (0.00 sec)

MariaDB [BANK]> SELECT * FROM CUSTOMER
    -> WHERE INSTR(LASTNAME,'a') > 0;
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
| id   | version | title | FirstName | Middlenames | LastName | Gender | Dob        | Dod  | Warning_flag | Worth |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
|    1 |    1.00 | Mr    | fname1    | NULL        | lname1   | m      | 1990-01-01 | NULL | NULL         | NULL  |
|    2 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
|    3 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
3 rows in set (0.00 sec)

MariaDB [BANK]>
MariaDB [BANK]> SELECT *
    -> from customer
    -> WHERE position('a' in lastname) > 0;
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
| id   | version | title | FirstName | Middlenames | LastName | Gender | Dob        | Dod  | Warning_flag | Worth |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
|    1 |    1.00 | Mr    | fname1    | NULL        | lname1   | m      | 1990-01-01 | NULL | NULL         | NULL  |
|    2 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
|    3 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
3 rows in set (0.00 sec)

MariaDB [BANK]>
MariaDB [BANK]> SELECT *
    -> from customer
    -> WHERE locate('a',lastname)  > 0;
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
| id   | version | title | FirstName | Middlenames | LastName | Gender | Dob        | Dod  | Warning_flag | Worth |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
|    1 |    1.00 | Mr    | fname1    | NULL        | lname1   | m      | 1990-01-01 | NULL | NULL         | NULL  |
|    2 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
|    3 |    1.00 | Mrs   | fname1    | NULL        | lname1   | f      | 1990-01-01 | NULL | NULL         | NULL  |
+------+---------+-------+-----------+-------------+----------+--------+------------+------+--------------+-------+
3 rows in set (0.00 sec)