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Description: SQL Server database query speed is slow, the following are common.
1. no index or index is used. This is the most common problem of slow query, which is the defect of programming.
2.I/O has a small throughput, forming a bottleneck effect
3. does not create a column that causes the query to be not optimized
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| Filename | Size | Date |
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| SQL查询优化.doc | 2522112 | 2018-05-04 |
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