select len('aqabbddddcceee') length,(len('aqabbddddcceee')- len(replace('aqabbddddcceee','dd','')))/len('dd') c_exist_count
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select len('aqabbddddcceee') length,(len('aqabbddddcceee')- len(replace('aqabbddddcceee','dd','')))/len('dd') c_exist_count
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