1.查詢乙個表中的所有資料
mysql> select * from wz;
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 1 | 學習 | james | 2018-09-13 |
| 10 | 工作 | mike | 2018-09-13 |
+----+--------+--------+------------+
2 rows in set (0.00 sec)
where效能：依賴索引，對主鍵進行where判斷效能很快
where操作符：
=：檢測兩個值是否相等
！=：檢測兩個值是否不等
>：檢測左邊是否大於右邊
<：檢測右邊是否大於左邊
>=：大於等於
<=：小於等於
字串：預設不區分大小寫，使用where binary可以實現區分大小寫，即嚴格匹配
返回值：對於select，若找到了，返回所有滿足條件的記錄，否則不返回任何資料，例子如下：
mysql> select * from wz where author = 'james';
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 1 | 學習 | james | 2018-09-13 |
+----+--------+--------+------------+
1 row in set (0.01 sec)
mysql> update wz set author = 'edward' where id = 1;
query ok, 1 row affected (0.03 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> select * from wz;
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 1 | 學習 | edward | 2018-09-13 |
| 10 | 工作 | mike | 2018-09-13 |
+----+--------+--------+------------+
mysql> delete from wz where id = 10;
query ok, 1 row affected (0.00 sec)
mysql> select * from wz;
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 1 | 學習 | edward | 2018-09-13 |
+----+--------+--------+------------+
1 row in set (0.00 sec)
mysql> insert into wz (title, author, data)
-> values
-> ('工作', 'james', now());
error 1054 (42s22): unknown column 'data' in 'field list'
mysql> insert into wz (title, author, date)
-> values
-> ('工作', 'edward', now());
query ok, 1 row affected, 1 warning (0.01 sec)
mysql> select * from wz;
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 1 | 學習 | edward | 2018-09-13 |
| 11 | 工作 | edward | 2018-09-14 |
+----+--------+--------+------------+
2 rows in set (0.00 sec)
mysql> select * from wz where author like '%ame%';
+----+--------+--------+------------+
| id | title | author | date |
+----+--------+--------+------------+
| 12 | 娛樂 | james | 2018-09-14 |
+----+--------+--------+------------+
1 row in set (0.00 sec)
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