日期之间（开始和现在）

Question

不确定如何使用NOW()函数。似乎应该是直截了当的，但是我没有运气

SELECT DISTINCT field
FROM table
WHERE field BETWEEN '2019-01-01' and NOW()

field = varchar

Answer 1

您应该匹配数据类型，以避免隐式转换：

SELECT DISTINCT field
FROM table
WHERE CAST(field AS DATE) BETWEEN DATE '2019-01-01' AND CURRENT_DATE;

---

SELECT DISTINCT field
FROM table
WHERE DATE(field) BETWEEN DATE '2019-01-01' AND CURRENT_DATE;