how to display columns as rows in sql

PremiseWhen this article discusses only SQL Server queries,For non-composite statistics, where the statistics for each field contain only the data distribution of theHow to estimate the number of rows based on statistical information when combining

In the development of the report, many times will encounter row and column conversion operations, the developer for the SQL level row and column conversion operation has been not very understanding, today just time to make some simple summary. Here

1: Three ways to build a tableBuilding a table will only create a table in the library and display it in the log, and there will be no output.1.1: Define columns yourself to create an empty tableColumn-specification = column-define +

How to use transform to convert rows and columns; In Oracle, to convert rows and columns, DECODE and CASE statements are commonly used. For simple row and column conversion, DECODE and CASE statements can still cope with it. In scenarios where the

Introduction: There is a computed in Microsoft SQL Server Columns columns. The value of this column is computed by an expression that refers to the value of the other columns of the same table. For example, there is a servicelog table containing

How to use SQL statements to convert rows and columns Row-to-column conversion is a common requirement in the database system. During database design, in order to fit the accumulated storage of data, direct record is often used, while displaying

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,

---restore content starts---[This afternoon to accept an emergency small task, is a set of record statistics, the chess game player's two records in a row of the display, into the database after the first thought is the row to the column, but at the

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

Introduction: When you add a TableAdapter to a typed dataset (Typed DataSet), the schema of the corresponding DataTable is already defined by the TableAdapter main query. For example, if the main query returns a, b,c these 3 domains, then The