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                                            lingyuntao

sql校验报错

sql校验，字段可以为空，但是校验结果不可以为空 ![lQLPJxbD0KZzH4LMrs0EP7CDXMYOlRZAvANB48C_gBAA_1087_174 png_620x10000q90](https://user-images.githubusercontent.com/115465083/194845915-a007e195-a39d-4aab-aaf1-355e356844a5.jpg) ![lQLPJxbD0KZzH1HNAWTNA8qwM-pHW1eIp5cDQePAtgCRAA_970_356 png_620x10000q90](https://user-images.githubusercontent.com/115465083/194845931-def7dc8c-1ecd-4dea-8ebe-486ebd9a0ee4.jpg)