teradata sql queries

Original: SQL Server queries all table names and rows of dataQuery all indicateSelectfromwhere xtype='u'select* from sys.tablesQuerying all table names and rows in the databaseSELECTA.name as [TABLE NAME], B.rows as [RECORD COUNT] fromsysobjects asaINNER JOINsysindexes asB ona.ID=b.idWHERE(A.type= 'u' ) and(B.indidinch(0,1 ) )ORDER byA.name, B.rowsDESCQuery all indication and space consumption \ l

these waits occur when queries involve Columnstore indexes, but they can also occur without Columnstore indexes Being involved if a hash operator runs in batch mode. Excerpt from "What's that Htdelete wait type?" It now uses one shared hash table instead of Per-thread copy. This provides the benefit of significantly lowering the amount of memory required to persist the hash table but, as a CA N Imagine, the multiple threads depending on this single

Label:Mnesia is a distributed database management system, suitable for telecommunications and other applications requiring continuous operation and with the soft real-time characteristics of the Erlang, more and more attention and use, but the current Mnesia data is not much, many only the official user guide. The following will focus on how the Mnesia database implements SQL queries to implement

When a query is made using an SQL statement, the result of the query is stored in a temporary file with a suffix named tmp. When the query, the file holds the results of the query, when the query is closed, the temporary file will be automatically deleted, so in our query, it is not feel the existence of the file. Where does the TMP file exist For Windows systems, there is a system environment variable that can be passed Right-click My Computer--Pr

Original: Using SQL Profiler to handle expensive queriesWhen the performance of SQL Server becomes worse, the following two things are most likely to occur: First, some queries produce a lot of pressure on system resources. These queries affect the performance of the entire system because the server is not abl

Sqlserver queries which stored procedures use a table without selectb. namefromsyscommentsa, sysobjectsbwherea. % f_tblog_kpi_content_new % Sqlserver queries which stored procedures use a table without select B. name from syscomments a, sysobjects B where a. id = B. id and a. text LIKE '% f_tblog_kpi_content_new %' SQL Server

alias, otherwise error; Exists sub-query: (difficult)Take the outer query results to the inner layer, to see if the internal query is set up; SELECT * from Stu where exists (SELECT * from goods where goods.cat_id = category.cat_id); Select queries the order by of the 5 clause:Sort by field:To reverse the order, use "desc" to declare it.The display declaration in ascending order is declared with "ASC"; Select Name, Fenshu from Stu Order by Fenshu, nam

SQL query special data that does not include date SQL quot; select * fromtestwheredatesnotin (#2010-05-03 #, #2010-05-12 #) quot; the date format must be prefixed with # so that we can find all the data that does not include #2010-05-03 #, #2010-05-12 #. Then, let's look at the stupid method 2 SQL quot; sele SQL

--Check the database for wait eventsFrom v$session_waitWhere event is not a like ' sql% ' and an event not a like ' rdbms% '--Find time-consuming operations in the systemSelect B.username Username,a.disk_reads reads,A.executions Exec,a.disk_reads/decode (a.executions,0,1,a.executions)Rds_exec_ratio,A.sql_text statementFrom V$sqlarea A,dba_users bwhere a.parsing_user_id=b.user_idand A.disk_reads >100000ORDER BY a.disk_reads Desc;--View the time-consumi

corresponding column in the database. Improveduse ParameterDirection (Specify a query within the DataSet the type of the parameter. ) enumeration type to improve the above.Where ParameterDirection has four members: input parameter, output parameter, inoutput (input and output parameter), ReturnValue (return value of the operation)Passing parameter Proceduresintroduction of ParameterDirectionSummaryBy introducing ParameterDirection, the efficiency of the query is improved, on the other hand it i

When the performance of SQL Server becomes worse, the following two things are most likely to occur: First, some queries produce a lot of pressure on system resources. These queries affect the performance of the entire system because the server is not able to serve other SQL

SQLServer no selectPr_Nameas [Stored Procedure], [Parameter] stuff (select, + [Parameter] from (selectPr. nameasPr_Name, parameter. name ++ Type. name + (+ convert (varchar (32), parameter. max_length) +) asParam SQL Server queries all stored procedure information, triggers, and indexes without the select Pr_Name as [Stored Procedure], [Parameter] = stuff (select ',' + [Parameter] from (select Pr. name as P

SQL Server queries all database names, table names, and field names. For more information, see. SQL Server queries all database names, table names, and field names. For more information, see. 1. Get all database names:SELECT Name FROM Master .. SysDatabases order by Name 2. Get all table names:SELECT Name FROM D

CREATE TABLE Emp(Eid char (primary key),ename char (20),Age-Integer Check (age > 0),Did char (20),Salary float,)CREATE TABLE Dept(Did char (primary key),Dname Char (20),Mgr_did Char (20),)ALTER TABLE EMP add constraint Fk_emp_did foreign key (did) references Dept (DID)ALTER TABLE Dept add constraint fk_dept_mgrdid foreign key (Mgr_did) references Emp (EID)Title: Write an SQL statement that queries the name

How can I quickly find the values in JSON by referring to the KBMMW JSON object operation?One way is through the method of traversal, in fact, in KBMMW there is a flexible way to query,is to query the values in JSON by SQL. In other words, the Tkbmmwmemsql control is used to implement.Tkbmmwmemsql can also be used to query XML and CSV files, just talk about JSON queries today.We first put a tkbmmwmemsql con

--returns a list of linked servers defined in the local server. EXECsys.sp_linkedservers/*creates or updates a mapping between logins on a local instance of SQL Server and security accounts in the remote server. When a user logs on to a local server and executes a distributed query to access a table on a linked server, the local server must log on to the linked server and access the table on behalf of that user. Use sp_addlinkedsrvlogin to specify th

1, temporary use method OpenRowsetA. Using OPENROWSET with SELECT with Microsoft OLE DB Provider for SQL ServerThe following example uses Microsoft OLE DB Provider for SQL Server to access the authors table of the pubs database on a remote data server named REMOTE1. Initializes the provider from DataSource, user_id, and password, and uses SELECT to query the data table.SELECT * from OPENROWSET (' SQLOLEDB '

Purpose: To filter the sum of two fields in a table as a where conditionQuerying for records with no expirationSelect a, from Test where a+b>now ();//A: Deposit time B: Validity period SQL will error when you make the above query.However, simply put the above SQL into the code and replace now () with the method of the current timestamp obtained by the corresponding language (e.g. time () in PHP), execute,

] . "‘,"; } } $group _account=RTrim($group _account, ‘,‘); $sql _all_account= "Select DISTINCT ' AccountName ', ' agentid ', ' ServerID ', ' Platform ', ' mTime ' from ' t_log_register ' WHERE ' AccountName ' in ( {$group _account}) and ' MTime ' $now _end_time}‘ "; $all _account= Fetchrowset ($sql _all_account); if(!Empty($all _account)){ Break; } }

parallel, said the update statistics to try first.a hit! a hit! a hit! Execute the following code:Update STATISTICS ods_table_a by default, the query optimizer updates the statistics as needed to improve the query plan, but in some cases, you can improve query performance by using update STATISTICS or stored procedure sp_updatestats to update statistics more frequently than the default updates. new inserted data no statistics, large table Automatic UPDATE STATISTICS trigger Automatic Update me