JSON_TABLE(expr,path_literalCOLUMNS(column_list))[AS]alias column_list:column[,column...]column: column_nameFORORDINALITY|column_name data_type PATH path_literal[json_value_on_empty_clause][json_value_on_error_
JSON_TABLE(expr,path_literalCOLUMNS(column_list))[AS]alias column_list:column[,column...]column: column_nameFORORDINALITY|column_name data_type PATH path_literal[json_value_on_empty_clause][json_value_on_error_clause]|column_name data_typeEXISTSPATH path_literal|NESTED[PATH]path_literalCOLUMNS...
首先,我们将使用 JSON_TABLE 从存储在EMP表中的 JSON 中抽取员工姓名和办公号。 SELECT t.first, t.last, t.office FROM emp, JSON_TABLE( emp.jsondoc, 'lax $' COLUMNS ( first VARCHAR(10) PATH 'lax $.name.first', last VARCHAR(10) PATH 'lax $.name.last', office VARCHAR(10) PATH 'lax...
nested path'$.cost_info' columns( a2_1 varchar(100)PATH'$.eval_cost', a2_2 varchar(100)PATH'$.read_cost', a2_3 varchar(100)PATH'$.prefix_cost', a2_4 varchar(100)PATH'$.data_read_per_join' ), a3 varchar(100)PATH'$.key_length', a4 varchar(100)PATH'$.table_name', a5 varch...
Thepathis relative to the parent path row path ofJSON_TABLE(), or the path of the parentNESTED [PATH]clause in the event of nested paths. on empty, if specified, determines whatJSON_TABLE()does in the event that data is missing (depending on type). This clause is also triggered on ...
JSON_TABLE( expr, path COLUMNS (column_list) ) [AS] alias column_list: column[, column][, ...] column: name FOR ORDINALITY | name type PATH string path [on_empty] [on_error] | name type EXISTS PATH string path | NESTED [PATH] path COLUMNS (column_list) ...
17.2 Using JSON_TABLE with JSON Arrays A JSON value can be an array or can include one or more arrays, nested to any number of levels inside other JSON arrays or objects. You can use a json_table NESTED path clause to project specific elements of an array. Example 17-3 projects the...
json-table-nested-column-definition 指定在現行層次巢狀的一或多個直欄。 巢狀路徑nested-path-expression-constant 指定解譯為 SQL/JSON 路徑的字元或圖形字串常數。nested-path-expression-constant指定 SQL/JSON 路徑表示式,可判定與項目相關的直欄值,該項目是在sql-json-path-expression中評估 SQL/JSON 路徑表...
JSON_nested_path::= 図json_nested_path.epsの説明 (JSON_basic_path_expression: Oracle Database JSON開発者ガイドを参照、JSON_columns_clause::=) ordinality_column::= 図ordinality_column.epsの説明 目的 SQL/JSONファンクションJSON_TABLEは、JSONデータのリレーショナル・ビューを作成し...
mysql> SELECT * -> FROM -> JSON_TABLE( -> '[ {"a": 1, "b": [11,111]}, {"a": 2, "b": [22,222]}, {"a":3}]', -> '$[*]' COLUMNS( -> a INT PATH '$.a', -> NESTED PATH '$.b[*]' COLUMNS (b INT PATH '$') -> ) -> ) AS jt -> WHERE b IS NOT ...