tricky sql queries

sys.objects WHERE type = ' P ') contains only user stored procedures, but execution sp_stored_procedures can query all kinds of stored procedures and all functions except system functions3.sys.modules ViewReturns a row for each system object that contains the SQL language definition module, with the associated SQL module for system objects of type FN, IF, P, PC, TF, and V.Therefore, for these types of obje

If you want to use OpenRowSet to query a remote database, the SQL Server prompts that the access error to the component \ 'ad hoc distributed queries \ 'is blocked. Search for the error on the Internet and find the solution: Enable ad hoc distributed queries:Exec sp_configure 'show advanced options', 1ReconfigureExec sp_configure 'ad hoc distributed queries ', 1

Each table in the database holds different data, and users often need to combine the data from multiple tables to extract the information they need. If a query needs to operate on more than one table, it is called a connection query. The result set or result table of a connection query, called a connection connection between tables. Queries actually query data through the association of common columns between tables, which is the main feature of relat

do not have any courses.Select sname from student where isn't exists (SELECT * from SC where student.sno=sc.sno)--or select sname from student where not in (select Sno from SC) --10, the inquiry has at least two elective course number and course name.Select Cno,cname from Course where CNO in (select CNO from SC GROUP by CNO have Count (*) >=2) --11, inquires the name of the student who took all the courses.Select sname from student where not exists(SELECT * from course where NOT exists(SELECT *

fact, is a Cartesian product, and cross join equivalent, the following query is the same as the above results. This may be common, but it is important to note that you are querying the complete set of all the combinations in both tables. As majorname from students,majors 3) query conditions are added Note: When you use the Cross join keyword to intersect a table, because the Cartesian product of two tables is generated, you cannot use the ON keyword, and you can define search conditions only i

Php queries the array of SQL output for help I want to explain the result output after SQL query in the form below? For example, if I query 19 data records How is the sorting number 2 3 1 3? Display SQL data 0th ~ with serial number 2 ~ Four serial numbers: 1, 2, 3, 4, and 5 Display

orParentID="') -->end Union All -->begin a recursive member SelectTB_ZYM_ZTBM. ztbm_id, TB_ZYM_ZTBM.ZTBM_NAME,TB_ZYM_ZTBM. ParentID,cast(Replicate(' 　　 ', Levle+1)+'|_'+Tb_zym_ztbm.ztbm_name as nvarchar(MAX)) asTE, CTE. OrderID* -+Row_number () Over(Order by GETDATE()) asOrderID, Levle+1 asLevle fromTb_zym_ztbmInner JoinCTE onTB_ZYM_ZTBM. ParentID=CTE. ztbm_id-->end ) Select * fromCTEOrder by LTRIM(OrderID) Reference: http://blog.csdn.net/bin_520_yan/article/details/5998349 htt

Note Notice where SQL queries exist: the Useofundefinedconstantmytime-assumedmytimeinvarwwwhtmlcalsncalresult.phponline15 appears this is the last line (15 rows) $ query quot; select * fromempoloyeewhe where SQL queries have a note Notice: Use of undefined constant mytime-assumed 'mytime' in/var/www/html/calsn/calr

When you write query queries, you often think of this problem: 1,foreach Circular Query $data = SELECT...;foreach($data as $item) $item['sub] = SELECT .... WHERE $item['xx'] ....; 2, multi-table Association join 先多表联合查询，然后重新组装数据 3, nested, sub-query So here's the problem. 考虑效率的时候，一般会如何选择，或者还有其他高效的查询方法； UpdateMaybe there was a problem with the presentation, and now I'm going back to a sample supplement: Virtual a scene:such as a list of articles, an

SQL statements that prevent repeated data in Multi-table queries in thinkphp (mandatory) and thinkphpsql Let's take a look at the example below: Tableid name1 a2 b3 c4 c5 B The library structure is like this. This is just a simple example, and the actual situation is much more complicated. Select *, count (distinct name) from table group by name Result: Id name count (distinct name) 1 a 12 B 13 c 1 T

Tags: server greater than from BLE tab style not row divSQL SERVER queries data between rows 20th through 301. Query the first 20 rows of the ID, after the query to remove 20 records of the first 10 recordsSelect Top * from Tbbank WHERE bankid not in (select Top BankID from Tbbank ORDER by BankID ASC) 2. Query the first 20 rows to record the maximum ID, after the query is greater than the value of the first 10 recordsSelect Top * from Tbbank WHERE ba

SELECTS.name, Q.name fromSys.Services asSJOINSys.service_queues asQ ons.service_queue_id=Q.object_id; ----mapping relationships for services and engagements sys.service_contract_usagesSELECTS.name as [Service], Q.name as [Queue], C.name as [Contract] fromSys.Services asSJOINSys.service_queues asQ ons.service_queue_id=Q.object_id JOINSys.service_contract_usages asU ons.service_id=u.service_idJOINSys.service_contracts asC onu.service_contract_id=c.service_contract_id; --clearing a session in an

Tags: style blog io os ar using SP Data 2014There are times when we often need to use some tables, or when to execute a stored procedure. Sorted out the SQL queries that were executed by the database during a certain period of time. You can also query the location of certain fields in the database. Very good very strong, hope to help everyone ~In the following section of the code, Bk_tsestatu is the field y

Environment Oracle 11.2.0 + SQL plus Problem Write a function as required: add 200 of the employees whose salaries are lower than the average wage in the Scott. EMP table, and return the total number of employees who have changed their salaries. An updated operation in PL/SQL, executing this function reports the following error: ORA-16551: unable to perform DML operations in

sys.dm_exec_query_stats:Sys.dm_exec_query_stats returns aggregate performance statistics for the cached query plan. Each query plan corresponds to a row in that view, and the lifetime of the row is associated with the plan itself. When you delete a plan from the cache, the corresponding row is also removed from the view. http://www.hengnay.com/C.v9/ms. Sqlsvr.v9.zh-chs/tsqlref9/html/eb7b58b8-3508-4114-97c2-d877bcb12964.htm3.1.2, the statement that causes the high CPU is running, this time can b

. connectionstring=con; con1. Open ();//Opening Database Stringsql= "Insert intoFileuploaded (Fileid,filename,filepath,qrcodepath,filesuffix) values (' "+filenamesave + "', '" "+filename+" ', ' "+filepath+" ', ' "+filepath+" ', ' "+filesuffix+" ');//CREATE statement insert data into database sqlcommandcmd=con1. CreateCommand ();//CREATE DATABASE command cmd.commandtext=sql; cmd. ExecuteNonQuery ();This article is from the "Secrets of Technology-

StatementSELECT * from database a.dbo. Table A, database b.dbo. Table b b WHERE A.field=b.field"DBO" can be omitted asSELECT * from Database A. Table A, database B.. Table b b WHERE A.field=b.fieldSQL Server database:--This is an IP or hostname that maps a remote database exec sp_addlinkedserver ' remote database ', N ' SQL Servers '--this is logged in to the remote database exec sp_ Addlinkedsrvlogin ' remote database IP or hostname ', ' false ', NUL

Simple development of PL/SQL stored procedures Paging of stored procedure using dynamic SQL procedure proc_goods_search_count(p_type number, p_keywords varchar2, p_number out number) is v_sql varchar2(4000);begin v_sql := ' select count(*) from lt_goods a where a.status = 2';if p_type is not nu

Number of times SQL queries repeat a table mark Id name pay 1 Zhang San 1000 2 Wang Lei 1200 3 Zhang San 5853 4. Wang Wu 8574 5, high, 1259 6 High, 985 ============================== How to query the duplicate value of the name field? I don't know how to write the SQL statement. The result is that Michael Jacob appears several times, Wang Lei appears several

information, the fourth is the column identification, and the fifth is the file group information. If I want to find information about a stored procedure, I can directly use sp_help procname, as shown in figure 4. Figure 4 Note that you sometimes need to use single quotes to include database objects. The first table finds information such as the name of the stored procedure, and the second table finds the parameter information. 　　 Sp_helptext Sometimes we need to find out what the Stored Proce