CREATE or Replace FUNCTION func_task_get_devicerule_devicelist( mf_comp integer, mf_id integer, md_comp integer, md_id integer, sdk_comp integer, sdkv integer) RETURNS setof view_device_alive AS $funcbody$ Declare queryString varchar(260); Begin queryString := func_task_getdevicerulequery(...
Here I did not get the query’s table data, I added union statement to get database tables names using sys.tables system view, and I've got the following result: Now I am able to simply get the list of all database tables and view any table I want, ...
This article is a case study on writing a complex query on an SQL database. We start with a set of database tables, populated with data. We then have a requirement to show some data by writing a query. We’ll write the query step-by-step and get to our final result. You’ll see...
theirsetXXXcalls do not interfere with each other. Moreover,Derbyis able to share the same compiled query plan between the two statements; it needs to maintain only separate state information. However, there is the potential for confusion in regard to the timing of thecommit, since a singleco...
在这里看到一行SQL语句: select<iftest="distinct">distinct</if>'true' as QUERYID,<includerefid="Base_Column_List"/>from task_record<iftest="_parameter != null"><includerefid="Example_Where_Clause"/></if><iftest="orderByClause != null">order by ${orderByClause}</if> 这里可以看到一个...
For each row returned for DEPTNO and DEPTNAME, the system finds where EMPNO = MGRNO and returns the manager's name. The result table produced by the query has the following values. Table 1. Result set for previous query
Explanation: Here, this query gives an output of the names of each learner, module title, and the trainer, based on the enrollments. It uses two LEFT JOINs to include all learners, even those who are not enrolled in any module. JOINS vs SUBQUERIES in SQL JOINSSUBQUERIES JOINS work faster...
of Armstrong relations to a toolbox of Armstrong tables. That is, we investigate structural and computational properties of Armstrong tables for the class of functional dependencies (FDs) over SQL tables. Relations are special instances of SQL tables with no duplicate rows and no null value ...
ADO.NET does not define a query language; therefore, data providers are not required to mask the differences in supported SQL statements between databases. DataDirect Technologies™ provides support for ODBC/JDBC SQL escapes for scalar functions, outer joins, and stored procedures in our providers....
When we execute DESCRIBE TABLE command in our database we will be able to view the structure of the table in a describe tab but not on the console tab of the system software. The SQL DESCRIBE TABLE query will make us to know about the organization of table that consists of name of tab...