书籍是全世界的营养品。生活里没有书籍，就好像没有阳光；智慧里没有书籍，就好像鸟儿没有翅膀。
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mysql>selectsleep(1);
+----------+
| sleep(1) |
+----------+
| 0 |
+----------+
1 rowinset(1.00 sec)
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mysql>selectnamefromanimalswherename='tiger';
+-------+
|name |
+-------+
| tiger |
+-------+
1 rowinset(0.00 sec)
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mysql>selectsleep(1),namefromanimalswherename='tiger';
+----------+-------+
| sleep(1) |name |
+----------+-------+
| 0 | tiger |
+----------+-------+
1 rowinset(1.00 sec)
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mysql>selectnamefromanimalswherename='pig';
Emptyset(0.00 sec)
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mysql>selectsleep(1),namefromanimalswherename='pig';
Emptyset(0.00 sec)
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mysql>selectnamefromanimalswherenamelike'%ger';
+-------+
|name |
+-------+
| ger |
| iger |
| tiger |
+-------+
3rowsinset(0.00 sec)
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mysql>selectsleep(1),namefromanimalswherenamelike'%ger';
+----------+-------+
| sleep(1) |name |
+----------+-------+
| 0 | ger |
| 0 | iger |
| 0 | tiger |
+----------+-------+
3rowsinset(3.01 sec)
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