If you’re not sure if the object you’re querying is a table or a view, you can also query the dba_views, all_views, or user_views objects. These queries perform a UNION ALL to show you a list of all tables and views in the Oracle database. DBA_TABLES and DBA_VIEWS SELECT'Ta...
Article for:SQL Server▾ Query below lists all table (and view) constraints - primary keys, unique key constraints and indexes, foreign keys and check and default constraints. Query selecttable_view, object_type, constraint_type, constraint_name, detailsfrom(selectschema_name(t.schema_id) +'...
Aging Report SQL Query Alias all columns in a given table Alias column with variable value in SQL Script All MonthNames and Month numbers in sql server All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists. all the ...
sql TEXT ); For tables, thetypefield will always be'table'and thenamefield will be the name of the table. So to get a list of all tables in the database, use the following SELECT command: SELECT name FROM sqlite_master WHERE type='table' ORDER BY name; For indices,typeis equal to...
Show all tables in the Oracle Database# To showall tablesin the entire Oracle Database, you query from thedba_tablesview as follows: SELECTtable_nameFROMdba_tables;Code language:SQL (Structured Query Language)(sql) You will get the following error message if you don’t have access to the...
SQL聚合函数 %DLIST SQL聚合函数 %DLIST 创建值列表的聚合函数。 大纲 代码语言:javascript 代码运行次数:0 %DLIST([ALL|DISTINCT[BY(col-list)]]string-expr[%FOREACH(col-list)][%AFTERHAVING]) 参数 ALL- 可选-指定%DLIST返回string-expr的所有值的列表。如果未指定关键字,则这是默认值。
SELECT id,content,user FROM comment UNION ALL (SELECT id, msg, user FROM feedback) ORDER BY id DESC; 1. union查询时,order by放在内层sql中是不起作用的;因为union查出来的结果集再排序,内层的排序就没有意义了;因此,内层的order by排序,在执行期间,被mysql的代码分析器给优化掉了。
本文对常用的数据结构详述:Array, ArrayList,List,IList,ICollection, Stack, Queue, HashTable, Dictionary, IQueryable, IEnumerable。 Collection(集合) Collection是数据记录集合, 编写代码过程中,常常需要合适的容器保存临时数据,方便修改和查找,如何选取合适的数据容器,关键在于将执行的数据操作以及数据记录是否大量。
CREATE DATABASE example_db; CREATE user 'example_user'@'192.0.2.0' IDENTIFIED BY 'password'; GRANT SELECT,INSERT,UPDATE,DELETE ON example_db.* TO 'example_user' IDENTIFIED BY 'password'; USE example_db; CREATE TABLE message_app_users (user_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, user...
TableId string 表ID。 44743*** ErrorMessage string 错误信息。 UnknownError Success boolean 请求是否成功,返回值如下: true:请求成功 false:请求失败 true 示例 正常返回示例 JSON格式 { "TotalCount": 1, "RequestId": "B16FB618-5E96-4FFD-BB0D-490C890A4030", "ErrorCode": "UnknownError", "Tab...