当针对列返回错误时, JSON_TABLE 的缺省行为是返回空值。 您可以通过将 ERROR ON ERROR 子句添加到列定义来覆盖strict方式。 返回JSON 格式化数据 JSON_TABLE 能够返回包含格式化为 JSON 的数据的列。 通过在列定义中使用关键字 FORMAT JSON 来完成此操作。 结果必须包含单个值 :JSON
SQL查询 SELECT json_extract(params,'$.item_id')asitem_id, count(id), page_name,params, COUNT(DISTINCT cookie_md5) FROM `temp_record` WHERE `page_name` IN ('api/GoodsItem/read','api/GoodsItem/readnew','api/GoodsItem/details') AND (params->'$.item_id'in(40349,40348,40347,40346,4...
You usejson_tablein a SQLFROMclause. It is arow source: it generates a row of virtual-table data for each JSON value selected by arow path expression(row pattern). The columns of each generated row are defined by thecolumn path expressionsof theCOLUMNSclause. Typically ajson_tableinvocation...
SELECT item_id, count(id), page_name, params, COUNT(DISTINCT cookie_md5) FROM `temp_record` WHERE `page_name` IN ('api/GoodsItem/read','api/GoodsItem/readnew','api/GoodsItem/details') AND ( item_id in (40349,40348,40347,40346,40345,40342,40341,40340,40334,40333,40332,40331,40330,...
ALTER TABLE `temp_record` ADD COLUMN `item_id` int(11) GENERATED ALWAYS AS (cast(json_extract(`params`,'$.item_id') as signed)); 3. 设置索引 进入设置,像添加普通字段的方式将item_id设置为普通索引。 4. 优化查询结果 SELECT item_id, count(id), page_name, params, COUNT(DISTINCT cookie...
ALTER TABLE `temp_record` ADD COLUMN `item_id` int(11) GENERATED ALWAYS AS (cast(json_extract(`params`,'$.item_id') as signed)); 3. 设置索引 进入设置,像添加普通字段的方式将item_id设置为普通索引。 4. 优化查询结果 SELECT item_id, count(id), page_name, params, COUNT(DISTINCT cookie...
SELECT*FROMjson_table(json_extract(t_json.book,'$.book'), "$[*]" COLUMNS( NAMEVARCHAR(60) path "$.name", priceDECIMAL(10,2) path "$.price" ) )ASJJ; 但是这个不行的,会提示: 错误代码: 1109 Unknown table 't_json' in a table function argument ...
Transform arrays of JSON objects into table format. Run any Transact-SQL query on the converted JSON objects. Format the results of Transact-SQL queries in JSON format. SQL Server 2025 changes SQL Server 2025 (17.x) Preview introduces the following JSON enhancements, all currently in preview: ...
SQL/JSON function json_table projects specific JSON data into columns of various SQL data types. You use it to decompose the result of JSON expression evaluation into the rows and columns of a new, virtual table, which you can also think of as an inline
JSON functions, first introduced in SQL Server 2016 (13.x), enable you to combine NoSQL and relational concepts in the same database. You can combine classic relational columns with columns that contain documents formatted as JSON text in the same table, parse and import JSON documents in rel...