AVG MAX MIN SUM Count, Variablename | HP c-tree-SQL ISQL and Tools

ISQL and Tools

COMPUTE statements have no effect until you issue a BREAK statement with the same break_spec.

Issuing the COMPUTE statement without any arguments displays the currently-set COM- PUTE specifications, if any.

Arguments

AVG MAX MIN SUM COUNT

The function to apply to values of column_name. The functions AVG, MAX, MIN, and SUM can be used only when the column is numeric. The function COUNT can be used for any col- umn type.

column_name

The column whose value is to be computed. The column specified in column_name must also be included in the select list of the query. If column_name is not also included in the select list, it has no effect.

variable_name

Specifies the name of the variable where the computed value is stored. ISQL issues an implicit DEFINE statement for variable_name and assigns the variable a value of zero. During query processing, the value of variable_name changes as ISQL encounters the specified breaks.

break_spec

Specifies the set of rows after which ISQL processes the COMPUTE statement. A COMPUTE statement has no effect until you issue a corresponding BREAK statement. See the description of the BREAK statement in Section 3.7.2 "BREAK" on page 3-13 for details.

Examples

The following example computes the number of items ordered by each customer.

ISQL> break on customer_name

ISQL> display col 5 "Number of orders placed by", customer_name, "=", n_ord on customer_name

ISQL> compute count of order_id in n_ord on customer_name;

ISQL> select c.customer_name, o.order_id from customers c, orders o where o.customer_id = c.customer_id;

CUSTOMER_NAME		ORDER_ID
-------------		--------
Sports Cars Inc.		1
Sports Cars Inc.		2
Number of orders placed by Sports Cars Inc.
=	2
Mighty Bulldozer Inc.		3
Mighty Bulldozer Inc.		4
Number of orders placed by Mighty Bulldozer Inc.

=2

.

.

.

3-22	FairCom Corporation

Image 48

HP c-tree-SQL ISQL and Tools manual AVG MAX MIN SUM Count, Variablename

Contents

Isql and Tools Reference Guide For use with c-treeSQL ServerPage Table of Contents Data Load Utility dbload Tutorial Source Code Iii FairCom Corporation Syntax Diagram Conventions Documentation OverviewPurpose of this Manual Audience Related Documentation Isql and Tools Introduction Overview Isql and Tools FairCom Corporation Quick Tour Introductory TutorialInit Isql Define ManageIsql Create Table Custmast Isql Commit Work Custmast Done Complete Introductory Tutorial CodeQuick Tour Relational Model and Indexing Tutorial ISQLTutorial2.sql Quick Tour Insert Into Values Insert IntoValues Commit Work QTY Price Complete Relational Model and Indexing Tutorial Source Code Locking Tutorial ISQLTutorial3.sql @ISQL @iSQLTutorial3.sql Isql Delete from Custmast Complete Locking Tutorial Source Code Transaction Processing Tutorial ISQLTutorial4.sql Transaction Rollback Work Complete Transaction Processing Tutorial Source Code Isql Statements Starting Interactive SQLSyntax Arguments Password Statement History SupportUsername Connectstring Formatting Output of Isql Queries Isql StatementsIsql Statements for Statement History Support Statement Summary Isql Statements for Query Formatting Summary Display Example 3-1 Unformatted Query Display from Isql Customername Customercity Orderid Ordervalue Formatting Column Display with the Column Statement Example 3-2 Controlling Display Width of Character Columns Example 3-3 Customizing Format of Numeric Column Displays OrdervalueCustomername Customercity Example 3-4 Specifying Column Breaks and Values with Display Numorders Customername Example 3-6 Specifying a Query Header and Footer with Title Help and Table Statements Transaction Support Isql Reference 1 @ Execute SyntaxDescription Example Break Syntax Breakspec Examples Skip nCustomername Clear Syntax History Argument Column SyntaxOption Break Column Compute Display Title Columnname Format formatstringHeading headingtext Date-Time Format Strings for the Column Statement Character Description Null ? Type Length Colname Not Null INTChar Orderinfo AmountSysdate FLD Column TitleNEW Title Compute AVG MAX MIN SUM Count Variablename Define Syntax Value Colposition DisplayvalueCOL columnnumber @columnname Edit Syntax Exit or Quit Syntax Related StatementsExit 10 GET Syntax Isql GET query.sql Isql RUN Help Commandsclauses Help SyntaxHistory Syntax Orderstate Lotlocation Following example illustrates usage of the History statement Hostcommand Host or SH or SyntaxFrom List Syntax Quit or Exit Syntax 16 RUN SyntaxQuit Isql History Save Syntax 18 SET SyntaxPagesize Linesize Pagesize numberlines Connection databasename Default Transaction Isolation Level isolationlevelIsql Break on Isql Select TBL from Systables TBL TBL Show Syntax Is Default ? Spool SyntaxFilename on Database Connections Start Syntax Argument …Isql Spool STK on Isql Spool OFF Null ? Type Length Colname Not Null INT Not Null Varchar Tablename Type Length Colname Null ?Date Title Syntax Left Center Right COL nText Double Isql Clear Title Isql and Tools FairCom Corporation Data Load Utility dbload Introduction Dbload Command Line Syntax CommandsfilePrerequisites for Dbload Options Data File Formats Data Load Utility dbload Commands File Variable Length RecordsFixed Length Records Next Record Define Record Statement Char Short Long Float Double For Each Statement Null Example 4-1 Sample dbload commands files Examples Compilation Errors Record name redefinedPosition not specified for fixed length record Fatal Errors Isql and Tools FairCom Corporation Data Unload Utility dbdump Prerequisites for Dbdump Dbdump Command Line Syntax Data Unload Utility dbdump Short Long Float Double For Record Statement Define Record custrec of Fixed Length 37 AS Isql and Tools FairCom Corporation Schema Export Utility dbschema Username.procedurename OutfileUsername.tablename Username.triggername Schema Export Utility dbschema DbschemaImport Begin END Isql and Tools FairCom Corporation Tutorial Source Code Commit Work Select * from Custmast Delete from Custmast Integer MoneyVARCHAR6 Tutorial Source Code Commit Work Delete from Custmast Imdesc VARCHAR48 Select * from orderlist Select * from orderitems Isql and Tools FairCom Corporation Symbols Index-i Isql Index-ii FairCom Corporation Index Index-iii FairCom Corporation