sql server list all tables

Find all columns with the same column name (regardless of type and accuracy) from different tables. Note that the number 3 in the last column is the number of tables to be queried. Select a. Name, count (1) as TT from syscolumns A, sysobjects B Where a. ID = B. ID and B. xtype = 'U' and B. Name in ('table _ 1', 'table _ 2', 'table _ 3 ') Group by A. Name Havi

name of the reference table and the corresponding key name, the following is divided into multi-step query):SELECT * from user_constraints c where c.constraint_type = ' R ' and c.table_name = table to queryQuery the column name of the FOREIGN KEY constraint:SELECT * from User_cons_columns cl where cl.constraint_name = FOREIGN key NameQuery the column name of the key referencing the table:SELECT * from User_cons_columns cl where cl.constraint_name = foreign key reference table key name5. Queryin

(1) system table: stores all SQL system information. The metadata stored in the database service is called metadata (for example, the user databases on the data server, the login accounts on the database server, and (1) system table: stores all

One, table variables Table variables were introduced for the first time in SQL Server 2000. The specific definition of a table variable includes a column definition, a column name, a data type, and a constraint. Constraints that can be used in table variables include primary KEY constraints, UNIQUE constraints, NULL constraints, and CHECK constraints (foreign KEY constraints cannot be used in table variabl

Truncate table Not allowed Allow Destruction mode Automatic destruction after batch finishes Explicitly call the DROP TABLE statement. Current session End auto-destructor (Global temp table: Also included when other conversational sentences are not in the reference table.) Transaction Only have a transaction when the table is updated, the duration is shorter than the temporary table Normal transaction length, longer than ta

The T-SQL statement that deletes the table is:DROP table Drop is discarded, and drop table means that a table is completely erased.There are two ways to delete table data: Delete and truncate.The use of delete is as follows:Delete from The usage of truncate is as follows:TRUNCATE TABLE The difference between delete and truncate is as follows:1. Delete can delete one or more data from a table, or delete all

, which are numbered from 75124 to 75132. This is 9 special orders, each with more than 120,000 detailed records. In other words, dbo. 90% of the data in Salesorderdetail_test will be in these 9 orders. The main use of "select [email protected]" to search out Sales.SalesOrderDetail all records inserted into Dbo.salesorderdetail. Executed 9 times altogether. 2.3 Table ScanThere are two types of tables i

SQL Server obtains all column names in the temporary table or whether the specified column name exists. SQL Server column names Retrieve all column names in the temporary table Select name from tempdb. dbo. syscolumns where id =

SQL Server queries all users who have purchased products in a certain period of time, and SQL server has bought The goods table is as follows: Name time productA 13:23:00 WFEYB 15:23:00; 34 ASGA 13:47:20 SGHC 19:56:03 HRTC 14:00:00 XCCA ESFW Select distinct oo. name FROM

Tags: single-table ext comments List Constrain generated Yes split and easy to useHttp://www.cnblogs.com/zhijianliutang/archive/2012/10/28/2743722.htmlWhen we have a larger amount of data, we need to split the large tables into smaller tables, and queries that only access departmental data can run faster, the rationale being that the data to be scanned becomes sm

a temporary table in the database. Therefore, there is another saying about temporary tables in ORACLE databases. We generally say that the temporary table of the ORACLE database is permanent, but the content of the temporary table is temporary. You only need to call the temporary table directly when you need it, instead of creating it temporarily. Unlike the SQL SERVE