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                ## position,locate ### 說明 | 函數 | 說明 | | --- | --- | | position(substr in str) | 返回子串substr在字符串str中第一次出現的位置 | | locate(substr , str ,start) | 返回子串substr在字符串str中第一次出現的位置 | ### 例子:預約編號為8位,不夠8位的前面填充0 ```sql SELECT id, position('許' IN baby_name), locate('許', baby_name) FROM baby; ```
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