sql query compare two columns same table

Label:Source: Use a T-SQL statement to bulk query the data table footprint and its number of rowsThe amount of space that the data table occupies and the number of rows that exist in the database to find. You can use sp_spaceused to match the name of the datasheet. You can generate the amount of space that the

sysname The index name. Index_description varchar (210) The index description. Index_keys nvarchar (2078) A table or view column that constructs an index on these columns. Columns that are indexed in descending order are listed in the result set with a minus sign (-) followed by the name of

Tags: SQL query statementsA large summary of T-SQL query statementsSecurity code: A Willing heart, desperate, Hyakuji Qin Guan end belongs to ChuCase SIX: Table as shown650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M00/86/3E/wKioL1e50LKzsUzzAAALPc-dNCw164.png-wh_500

The SQL multi-table join query instance provides four SQL multi-table join query instances, with different efficiency. The SQL multi-table j

About SQL multiple table joint Query method A lot of, we are today to talk about SQL multiple table query usage and instance code, generally use the SELECT * FROM (SELECT) union to operate. Select Type, SUM (total amount) fr

The examples in the books I read when I used to learn connection queries have no practical significance. I just put two tables together and only understood the syntax, but I don't know why I used connection queries, what are the benefits of connection query. Recently, when I was studying Hibernate and reviewing SQL, I thought of a particularly good case (experience: it is difficult to learn

A friend once asked me the following question: how to add a new column (regular) in the query results )? For example, the structure and data in the database are as follows: (tablename: People) Name age Changchang 20 Charles 23 Sunny 21 Huangzhs 22 Dazu 65 Now, the query results are displayed as follows using SQL statements: ID name age 1 changchang 20 2 Charles 2

Atitit.mysql the use of the Oracle with AS Mode temp table pattern CTE statement to reduce the structural MSSQL SQL for subqueries Server:1. With ... as (...) in the MySQL what should be said in 12. Sub-query and query nesting is mainly easy to improve readability, 23. the solution in MYSQL :: temp

Stu_detail--second row description table connection on student.s_id = stu_detail.s_id; --The third line describes the conditions of the connection, usually the ID is equal 2. Full-Outer connection A full outer join, also known as a full outer join, returns all the record data in two connections. In the student table and the Stu_detail table, use the full outer

Tags: where outer connection from age 17.1 computer common elective right outer connection2017.11.14 Second: The most basic connection query----multi-table Query1. Using an internal connectionInternal connections are also called natural connections, the most common form of connectionGrammar:Select list from table name 1, tabl