sql stddev

processed. Sqlwks> insert into table3 values ('gao', 1111.11 ); Sqlwks> insert into table3 values ('gao', 1111.11 ); Sqlwks> insert into table3 values ('zhu', 5555.55 ); Sqlwks> commit; SQL> select AVG (distinct Sal) from Gao. table3; AVG (distinctsal) ---------------- 3333.33 SQL> select AVG (all Sal) from Gao. table3; AVG (allsal) ----------- 2592.59 61. Max (distinct | all) For maximum value, "all" ind

To create a database:1 CREATE DATABASETest--The name of the database to be created2 on PRIMARY3 (4 --specific description of the database file5NAME='Test_data',--logical name of the master data file6FILENAME='E:\project\Test_data.mdf',--physical name of the master data file7SIZE=5MB,--Initial size of master data file8MAXSIZE=100MB,--maximum growth of the master data file9FileGrowth= the% --growth rate of master data filesTen ) One LOG on A ( - --the specific

)----------------3333.33 SQL> select AVG (all Sal) from Gao. table3; AVG (allsal)-----------2592.59 61. Max (distinct | all)For maximum value, "all" indicates the maximum value for all values, and "distinct" indicates the maximum value for different values. For the same value, only one time is used.SQL> select max (distinct Sal) from Scott. EMP; Max (distinctsal)----------------5000 62. Min (distinct | all)Minimum value. "All" indicates minimum value

) ---------------- 5000 62.MIN (distinct| All) The minimum value, all means the minimum value for all values, distinct represents the minimum value for different values, the same only take once sql> Select min (All sal) from Gao.table3; MIN (Allsal) ----------- 1111.11 63.STDDEV (Distinct|all) For standard deviation, all indicates a standard deviation for all values, and distinct indicates that on

Java. util. Date and Java. SQL. Date, java. SQL. Time, java. SQL. Timestamp interchange, java. SQL. timestamp 1. SQL time type to util time type Principle: java. SQL. date, java. SQL. t

Tags: implementation mechanism originally page organizes tables based on free article content index ClustFollowing the book on SQL tuning (SQL tuning or SQL optimization) in the essentials of high-performance SQL tuning and case resolution, we talk today about one of the most important core mechanisms of

(score) score from student; Select AVG (DISTINCT score) from student; Select Classno,avg (Score) score from student group by Classno; Statement 3 output Result: Max --max (distinct|all) select Max (score) from student; Select Classno, Max (score) score from student group by Classno; Min --min (distinct|all) Select min (score) from student; Select Classno, min (score) score from student group by Classno; StdDev (standard deviation) standards devi

1 Results: 11 Avg --avg (distinct|all) select AVG (score) score from student; Select AVG (DISTINCT score) from student; Select Classno,avg (Score) score from student group by Classno; Statement 3 output Result: Max --max (distinct|all) select Max (score) from student; Select Classno, Max (score) score from student group by Classno; Min --min (distinct|all) Select min (score) from student; Select Classno, min (score) score from student group by Classno;

35. use SQL query analyzer and SQL profilerUse SQL query AnalyzerUse SQL profilerOptimize T-SQL statementSummaryIn this chapter, we will continue with the description of the pre-stored procedures in Chapter 21st. This chapter describes how to use

Tags: and fast speaking tuning market buffer way a completely"High-performance SQL Tuning essentials and Case Resolution" a book has been launched, many enthusiastic readers on the contents of the book and some of the specific questions raised questions, because of the numerous readers plus my daily work busy, here on the SQL tuning learning to discuss and a unified answer to the hot issues.First, let's tal

13. T-SQL and SQL query AnalyzerWhat is SQL?What is T-SQL?Introduce new features of T-SQLHow to Use T-SQLSummaryIn this chapter, we will introduce some basic concepts about the Structured Query Language What is SQL?　SQL is a datab

Sqlserver Management Common field types: Bit (optional values: 0, 1), datetime, Int, varchar, and nvarchar (may contain nvarchar for Chinese) Differences between varchar, nvarchar, and char (N): Fill in spaces for less than N parts of char (n. VaR: Variable, variable. SQL statements Use strings in SQL statementsSingle quotes. SQL