【MySQL】REPEAT()函数
复制字符串，有点儿像Python中*的作用，做个测试，有点儿意思。
语法：REPEAT(str,count)
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## 复制字符串Abc，共5套'Abc'字符串 mysql> select REPEAT('Abc',5); +-----------------+ | REPEAT('Abc',5) | +-----------------+ | AbcAbcAbcAbcAbc | +-----------------+ 1 row in set (0.00 sec) mysql> mysql> select REPEAT('Abc',1); +-----------------+ | REPEAT('Abc',1) | +-----------------+ | Abc | +-----------------+ 1 row in set (0.00 sec) mysql> ## 如果参数为<=0，那么返回空 mysql> select REPEAT('Abc',0); +-----------------+ | REPEAT('Abc',0) | +-----------------+ | | +-----------------+ 1 row in set (0.00 sec) mysql> select REPEAT('Abc',-1); +------------------+ | REPEAT('Abc',-1) | +------------------+ | | +------------------+ 1 row in set (0.00 sec) mysql> ## 这个比较有意思，还可以是小数，不过遵循四舍五入 mysql> select REPEAT('Abc',1.5); +-------------------+ | REPEAT('Abc',1.5) | +-------------------+ | AbcAbc | +-------------------+ 1 row in set (0.00 sec) mysql> select REPEAT('Abc',1.3); +-------------------+ | REPEAT('Abc',1.3) | +-------------------+ | Abc | +-------------------+ 1 row in set (0.00 sec) mysql> |