WebActive voice is the term for a verb whose subject performs the action of the verb. For example: John painted the fence. (In this example, "painted" is a verb in the active voice because the subject of "painted" ("John") is performing the action, i.e., did the painting. So, this is an example of an active sentence with a verb in the active voice.) WebStructured questionnaire is the primary measuring instrument in survey research. The use of structured questionnaire has a close relationship with quantitative analysis. The use of structured questionnaires in social research was pioneered by Francis Galton and is very common in the collection of data in quality of life research nowadays.
SELECT *对SQL性能不好的原因 - 知乎 - 知乎专栏
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SQL SELECT DISTINCT 语句 - w3school
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