informix count

INFORMIX databases are widely used relational databases. How to improve their application performance is a matter of concern. Especially with the increasing volume of data in databases and the increasing volume of transactions processed by

Oracle basic concepts and comparison with informix I. ConceptsUser: informix directly uses the user management system of the operating system. Generally, root and informix are used as super operators to manage other users. Oracle has its own user

Create a federated database for DB2 UDB and Informix IDS using DB2 II Cisco and Huawei network technology-the largest network content Teaching Resource Network (vlan9.com) Http://www.qqread.com Author: Source:

Basic differences between oracle and informix 1: View tablespaces Selectb. file_name physical file name, B. tablespace_name tablespace, B. bytes/1024/1024 size M, (B. bytes-sum (nvl (. bytes, 0)/1024/1024 used M, substr (B. bytes-sum (nvl (. bytes, 0

After checking Oracle's process command output, the output display should include at least some of the following processes:Oracle The process of writing a data file, the output appears as: "ORA_DBW0_ORCL" Oracle The process of writing log files, the

Check the space usage of each dbspaces: select name dbspace, sum (chksize) allocated, sum (nfree) free, round (sum (chksize)-sum (nfree )) /sum (chksize) * 100) | "%" pcused form sysdbspaces d, syschunks c where d. dbsnum = c. dbsnum group by name

Source: http://dev.csdn.net/article/60/60822.shtm Detailed usage of Informix SQL Functions I. Internal functions1. Internal Aggregate functions1) count (*) returns the number of rows2) count (distinct colname) returns the number of unique values in

I. Intrinsic functions1. Internal aggregate function1) Count (*) returns the number of rows2) Count (DISTINCT colname) returns the number of unique values in the specified column3) SUM (colname/expression) Returns the value of the specified column

I. database query User Creation The bank Informix_on_line database stores a large amount of important information from depositors. To ensure database security, strict regulations must be imposed on data operations. For example, to enter the on_line

Function Detailed usage of Informix SQL functions One, internal functions 1. Internal aggregate function 1) Count (*) returns the number of rows 2 count (DISTINCT colname) returns the number of unique values in the specified column 3) SUM