作业帮(not studentr.date is null),SQLsql中有这种写法吗？not 字段 is null 这是什么意思？？？？
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(not studentr.date is null),SQLsql中有这种写法吗？not 字段 is null 这是什么意思？？？？
(not studentr.date is null),SQL
sql中有这种写法吗？
not 字段 is null 这是什么意思？？？？
(not studentr.date is null),SQLsql中有这种写法吗？not 字段 is null 这是什么意思？？？？
is null 就是判断 studentr.date是否为空 如果为空就返回 TRUE
不为空就返回 FALSE
前面又有个 not 相当于把真假值取反
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(not studentr.date is null),SQLsql中有这种写法吗？not 字段 is null 这是什么意思？？？？
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