Detailed introduction to data filtering

This article mainly introduces a MYSQL question that skillfully uses character functions for data filtering. Friends who need it can refer to the following problem description: Structure: test has two fields, namely col1 and col2, both of which are character fields. The contents are three numbers separated by ",", and correspond one to one. For example, the contents of col1 are: 26, 59, 6. The contents of col2 are: 1502.5, 1690, 2276.77. The one-to-one correspondence means that the value of 26 is 1502.5, and the value of 59 is 1690, 6 corresponds to 2276.77 Search conditions: Select an id, such as 59, and then enter a number, such as: 2000. Then search for records with id=59 in col1, and then search for col2 less than 2000, that is, 1690

1. MYSQL uses a character function to filter data

Introduction: This article mainly introduces a MYSQL question about using character functions to filter data. Friends who need it can refer to

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3. A lot of questions about data filtering

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Introduction: BEGIN INSERT INTO t_order_pricesum(r_company,priceSum) SELECT r_company,sum(price) FROM t_order GROUP BY r_company; END I put the After the data is filtered and summed, it is inserted into t_order_pricesum, but the function is executed after t_order is updated. Because it already has a value, it cannot be updated. How can I update the data without deleting the data in the t_order_pricesum table?

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