lambdaquerywrapper.minus
时间: 2024-01-04 10:16:20 浏览: 133
`lambdaquerywrapper.minus` 是什么?
`lambdaquerywrapper.minus` 是一个 Python 库,用于生成 SQL 查询语句。其中的 `minus` 方法可以用于生成 SQL 中的 `MINUS` 操作符,用于从一个查询结果中减去另一个查询结果。
例如,以下代码将生成一个 SQL 查询语句,该语句从 `table1` 中选择所有行,然后从 `table2` 中选择所有行,并返回在 `table1` 中但不在 `table2` 中的行:
```python
from lambdaquerywrapper import Query
q1 = Query().select_from('table1')
q2 = Query().select_from('table2')
q3 = q1.minus(q2)
print(q3)
# 输出:SELECT * FROM table1 MINUS SELECT * FROM table2
```
相关问题
LocalDateTime.minus
LocalDateTime类的minus系列方法是用来进行时间减法计算的。这些方法可以通过获取LocalDateTime对象后进行调用。其中,minusYear方法可以实现年的减法计算,minusMonths方法可以实现月的减法计算,minusDays方法可以实现日的减法计算,minusHours方法可以实现时的减法计算,minusMinutes方法可以实现分的减法计算,minusSeconds方法可以实现秒的减法计算,而minusWeeks方法可以实现周的减法计算。使用这些方法可以方便地对时间进行减法操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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LocalDate.minus()方法使用
The `minus()` method in `LocalDate` subtracts a specified amount of time from the current date and returns a new `LocalDate` object. It has several overloaded versions:
1. `minus(long amountToSubtract, TemporalUnit unit)`: This method subtracts the specified amount of time from the current date using the specified unit of time.
For example: `LocalDate today = LocalDate.now(); LocalDate yesterday = today.minus(1, ChronoUnit.DAYS);`
2. `minus(TemporalAmount amountToSubtract)`: This method subtracts the specified amount of time from the current date using the specified `TemporalAmount` object.
For example: `LocalDate today = LocalDate.now(); Period period = Period.ofDays(1); LocalDate yesterday = today.minus(period);`
In both cases, the `minus()` method does not modify the original `LocalDate` object, but creates and returns a new `LocalDate` object with the specified time subtracted.
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