问题描述:
判断某个字段不为空,可以使用 IS NOT NULL 操作符
案例:
SELECT * FROM employees WHERE name IS NOT NULL;
SELECT * FROM employees WHERE name != ''
【超图 SuperMap3D】【基础API使用示例】53、超图SuperMap3D - 绘制矩形面
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2024-03-29
判断某个字段不为空,可以使用 IS NOT NULL 操作符
SELECT * FROM employees WHERE name IS NOT NULL;
SELECT * FROM employees WHERE name != ''
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