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查询表字段信息sql

SELECT COLUMN_NAME 列名, data_type 数据类型, SUBSTR(COLUMN_TYPE,INSTR(COLUMN_TYPE,'(')+1,INSTR(COLUMN_TYPE,')') - INSTR(COLUMN_TYPE,'(')-1) 字段长度, if(IS_NULLABLE='YES','否','是') 是否必填, COLUMN_COM...

问答 2022-04-15 来自：开发者社区

什么是数据的血缘信息？为什么我如下任务包含的sql显示不出血缘信息？

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