sql query to compare two tables in different databases

Query the disk space used by all databases in mysql and the size of all tables in a single database SQL code www.2cto.com select TABLE_NAME, concat (truncate (data_length/1024/1024, 2), 'mb') as data_size, concat (truncate (index_length/1024/1024, 2), 'mb') as index_size from information_schema.tables where TABLE_SCHEM

database to be created exist, and whether the website space exists, if the statement does not exist, run the create statement. 2. Delete objects in a database in batches. For example, you can delete tables, views, indexes, and other objects created by all users in a specific database at a time. You can query the objects in a table and then use SQL statements to

Add, delete, modify, and query databases and tables based on mysql operations I. Database Management-- 1. log on to the database 1 mysql -u root -p; -- 2. view all databases on the database server 1 SHOW DATABASES; -- 3. Create a database CREATE DATABASE MyDATA; -- 4. Cre

/* 1. query all databases in SQLSERVER */ Use master Go Select * from sysdatabases where dbid> 4/* The where condition is used to remove the system database */ Go /* 2. query all databases (Stored Procedures) in SQLSERVER )*/ Exec sp_helpdb /* 3. query

/* 1. query all databases in sqlserver */ Use master Go Select * From sysdatabases where dbid> 4/* The where condition is used to remove the system database */ Go /* 2. query all databases (Stored Procedures) in sqlserver )*/ Exec sp_helpdb /* 3. query

Tags: name splay DDR Sele user establishes time instance fromOracle cross-Library query table data createtime--2018 April 14 11:56:54 Author:marydon1. Usage Scenarios When you need to access the data in library B from a library, you need to connect the two libraries together. 2. Code implementation First step: Create a database connection Template Create Database Link, just a name . to by Password ' ( DESCRIPTION = (

Procedure UID Smallint The schema ID of the object owner.For databases upgraded from the old version of SQL Server, the schema ID is equal to the owner's user ID.Important:If you use any of the following SQL Server DDL statements, you must use the SYS. Objects directory view instead of SYS. sysobjects.Create | alter | drop userCreate | alter

To be continued ...... To be continued ...... To be continued ...... To be continued ...... 1. query the space occupied by a table. To be continued ...... To be continued ...... To be continued ...... To be continued ...... 1. query the space occupied by a table col tablespace_name for a15 col segment_name for a15 col segment_type for a15 select segment_name, segment_type, tablespace_name, extents, bytes/10

-valued function TF = SQL Table-valued function U = table (user-defined type) UQ = UNIQUE Constraint V = view X = Extended Stored Procedure IT = Internal table I've introduced sysobjects this system table before. Custom tables, stored procedures ..... will be stored in this form.

user account (or the corresponding ID of the account ). When other users log on to the system, the system first queries from this temporary table to check whether the same user records exist. If yes, the user will be rejected and the user will be warned that the same user has logged on. When the user exits the system normally or ends the current session due to other reasons, the database system will clear the contents of this table. In this way, you can log on to the system even if you log on t

1. System Table sysobjects Each object (such as constraints, default values, logs, rules, and stored procedures) created in the database corresponds to a row. Column name Data Type Description Name Sysname Object Name Id Int Object ID number Xtype Char (2) Object type. It can be one of the following object types:AF = aggregate function (CLR)C = CHECK ConstraintsD = DEFAULT value or DEFAULT ConstraintF = foreign key constraintL = LogFN

, select the file save path in the filename option → next → next Step → finish. 2. Create a new database locally (the database name cannot be the same as the database name that will be compared), and then execute the first step of the saved file in the newly created database. 3, began to compare two databases, execute the following SQL statement, the follow

You can access SQL Server through ado, and execute corresponding SQL statements to create databases and tables. The following are definitions in SQL Server books online. Table creation: Create Table[Database_name. [owner].| Owner.] Table_name({| Column_name as computed

Section - class - database Development and ADODatabase SQl, creating databases and Tables , Adding and deleting statements , Constraints , Top and the Distinct, Introduction to Aggregation functionsGetting Started with SQL statements (scripts, commands)SQL full name is a st

Table rpt_pro_elec.pdf and table rpt_pro_elecfee1, The two tables have the same structure, that is, the primary keys and fields are the same. The primary keys are: dept_id, trade_code, elec_type_old, elec_type_new, rpt_month, tou_tag, diff_price_type, htrade_code, Now all I need to do is find records with the same primary key but different values in other fields in the two

table in the second query. As shown in Listing D. Now you can find the line that doesn't match. The following are the referenced contents:OrderNo OrderDate Ordernumberorderdate1 2007-02-23 00:00:00.0001 2007-02-23 00:00:00.0002 2007-02-24 00:00:00.0002 2007-02-24 00:00:00.0002007-02-24 00:00:00.000 NULL NULL2007-02-25 00:00:00.0003 011 2007-02-25 00:00:00.000 Suppose there are some rows in the order_1 and not in the order_2. Y

security', -,3), -('Mobike', $,3),('BMW', -,3),('Mercedes', -,3); - ---Check all bikes and show the owner name of the bike -SELECT B.*,m.manname from T_bike b joins T_man m on m.id=B.manid; in ---Query John Doe all bikes (internal connection: showing two tables with linked data) toSELECT b.*, m.manname from T_bike B joins T_man m on M.id=b.manid WHERE m.manname='John Doe'; +SELECT b.*, M.manname from T

The database->ssmstest-> table there, you will find the three tables that have just been created.(Select Database->ssmstest-> table->dbo.student Right-click to select the design to see the details of the table you just created.) ） 3.2 Creating tables with SQL statements 3.2.1 Select Database->sqltest, and then select New Que