把query result serialize to json SELECT TOP 1 * FROM Country FOR JSON AUTO, INCLUDE_NULL_VALUES, WITHOUT_ARRAY_WRAPPER; {"CountryId":6,"Name":"Malaysia122"} AUTO 是一种 mode, 它会依据你的 join 把 child table 变成一个 child
"first name": "first xiaoming", "age": 20, "sex": null, "info": { "addr": "xiaominglu" }, "books": [{ "name": "语文", "score": 85.5 }, { "name": "数学", "score": 98 }] } '; select JSON_QUERY(@jsontext) as '无path', JSON_QUERY(@jsontext,'$') as '$', JS...
JSON_QUERY( expression [ , path ] [WITHARRAYWRAPPER]) Arguments expression An expression. Typically the name of a variable or a column that contains JSON text. IfJSON_QUERYfinds JSON that isn't valid inexpressionbefore it finds the value identified bypath, the function returns an error. IfJS...
create index idx_tb_test_json_column on tb_test (json_value(json_column, '$.age' RETURNING varchar(64))); 1. 注意,索引条目是字符串类型的。 2.6 其他JSON 功能 下面是一些常用其他的JSON功能: 3 数组功能 PostgreSQL 中提供了两种的数组可作为字段类型,一种是数组类型,一种是类型是jsonb的json数组。
JSON_ARRAYAGG JSON_MODIFY JSON_OBJECT JSON_OBJECTAGG JSON_PATH_EXISTS JSON_QUERY JSON_VALUE Mathematical Logical Metadata Ranking Replication Security String System System Statistical Text & Image Trigger Language elements Queries Statements ดาวน์โหลด PDF ...
SQL Server 2025 (17.x) Preview introduces the following JSON enhancements, all currently in preview: Modify method for thejsontype CREATE JSON INDEX JSON_CONTAINS function ANSI SQL path expression array wildcard support ANSI SQL WITH ARRAY WRAPPER clause in JSON_QUERY function ...
JSON_QUERY (Transact-SQL) extracts an object or an array from a JSON string. JSON_MODIFY (Transact-SQL) changes a value in a JSON string. Example In the following example, the query uses both relational and JSON data (stored in a column named jsonCol) from a table called People: sql ...
JSON_QUERY( expression [ , path ] [WITHARRAYWRAPPER]) Arguments expression An expression. Typically the name of a variable or a column that contains JSON text. IfJSON_QUERYfinds JSON that isn't valid inexpressionbefore it finds the value identified bypath, the function returns an error. IfJS...
json_value(@json,'$.info.tags[0]')astag 2,返回JSON数据(JSON_QUERY) 使用JSON_QUERY ( expression [ , path ] ) 函数,根据Path 参数,返回JSON 数据(JSON fragment);参数path是可选的(optional),如果不指定option参数,那么默认的path是$,即,返回整个JSON数据。
Since JSON_QUERY always returns valid JSON, FOR JSON knows that this result does not have to be escaped.JSON generated with the WITHOUT_ARRAY_WRAPPER clause is escaped in FOR JSON outputQuestion. I'm trying to format a column expression by using FOR JSON and the WITHOUT_ARRAY_WRAPPER...