通过user_tab_columns视图确认,当前表含有1000个列。 执行alter table add column,尝试增加第1001个列,此时提示了ORA-01792错误,指出表或视图中允许的列最大个数是1000,得到验证, 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SQL>create tablea(id number);Table created.SQL>begin2foriin1..999loop3ex...
DATA_TYPE 类型, DATA_LENGTH 长度 from USER_TAB_COLUMNS where TABLE_NAME = '表名'; ...
EXECUTE IMMEDIATE sql_hard INTO vv; IF vv>0THEN dbms_output.put_line('[字段值所在的表.字段]:['||rec1.table_name||'].['||rec1.column_name||']'); END IF; END IF; END LOOP; END; 方法2: DECLARE CURSOR cur_query IS SELECT table_name, column_name, data_type FROM user_tab_co...
--- -- 这里是查询 数字型字段值 /*declare CURSOR cur_query IS select table_name, column_name, data_type from user_tab_columns; a number; sql_hard varchar2(2000); vv number; begin for rec1 in cur_query loop a:=0; if rec1.data_type ='NUMBER' THEN a := 1; end if; if a>0...
Get all table columns get /database/objects/columns/Returns all records from DBA_TAB_COLUMNS or ALL_TAB_COLUMNS view depending on role at runtime. Records included in the response describes the columns of all tables, views, and clusters that the role has access to. A client requires ...
Scope of rows: (A) all check constraints with columns on a table accessible to the current user in Oracle database, (B) all check constraints with columns on a table in Oracle database Ordered by schema name and table name and column position Sample results Create beautiful and useful docum...
If you're using Power BI Report Server, consult the guidance in theOracle Connection Typearticle. Next steps Optimize Power Query when expanding table columns
tabname => upper('TABLENAME'), -- 要分析的表名(需要替换) method_opt => 'for all indexed columns', no_invalidate => false, -- 如果设置为 TRUE,则不会使相关游标无效。如果设置为 FALSE,该过程会立即使相关游标无效。 force => true -- force:即使表锁住了也收集统计信息. ...
all_tab_columns:存放数据库表所有列相关信息的视图。 TABLE_NAME:需要查询的目标表的名称。执行上述语句时,请替换'tablename'为实际需要查看的表名称。 您也可以执行select * from 'tablename';,查询目标表的所有信息,获取数据类型。 创建数据源 在进行数据同步任务开发时,您需要在DataWorks上创建一个对应的数据源...
https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/JSON_QUERY.html#GUID-6D396EC4-D2AA-43D2-8F5D-08D646A4A2D9 还可以使用json_table函数, SQL> select , , jt.goal 2 from tjson j, 3 json_table(j.json_data, '$' columns(name varchar2(50 char) path '$.name'...