The following is adapted from here MySQL What is DDL, DML and DCL?: DDL DDL is short name of Data Definition Language, which deals with database schemas and descriptions, of how the data should reside in the database. CREATE – to create database and its objects like (table, index, views, store procedure, function and triggers). … Read more
There are ways of doing this in optional parts of the standard, but a lot of databases support their own way of doing it. A really good site that talks about this and other things is http://troels.arvin.dk/db/rdbms/#select-limit. Basically, PostgreSQL and MySQL supports the non-standard: SELECT… LIMIT y OFFSET x Oracle, DB2 and MSSQL supports the … Read more
Performance wise, they are exactly the same (at least in SQL Server). PS: Be aware that the IMPLICIT OUTER JOIN syntax is deprecated since SQL Server 2005. (The IMPLICIT INNER JOIN syntax as used in the question is still supported) Deprecation of “Old Style” JOIN Syntax: Only A Partial Thing
It’s declaring the string as nvarchar data type, rather than varchar You may have seen Transact-SQL code that passes strings around using an N prefix. This denotes that the subsequent string is in Unicode (the N actually stands for National language character set). Which means that you are passing an NCHAR, NVARCHAR or NTEXT value, … Read more
The error happens because MySQL can index only the first N chars of a BLOB or TEXT column. So The error mainly happens when there is a field/column type of TEXT or BLOB or those belong to TEXT or BLOB types such as TINYBLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, MEDIUMTEXT, and LONGTEXT that you try to make … Read more
Editor warning: This solution is computationally inefficient and may bring down your connection for a large table. NB – You need to do this first on a test copy of your table! When I did it, I found that unless I also included AND n1.id <> n2.id, it deleted every row in the table. If … Read more
In SSMS in the Object Explorer, right click on the database, right-click and pick “Tasks” and then “Generate Scripts”. This will allow you to generate scripts for a single or all tables, and one of the options is “Script Data”. If you set that to TRUE, the wizard will generate a script with INSERT INTO … Read more
Note, the parentheses are required for UPDATE statements: update top (100) table1 set field1 = 1
It goes something like: from t1 in db.Table1 join t2 in db.Table2 on t1.field equals t2.field select new { t1.field2, t2.field3} It would be nice to have sensible names and fields for your tables for a better example. 🙂 Update I think for your query this might be more appropriate: var dealercontacts = from contact … Read more
You need to alias the subquery. SELECT name FROM (SELECT name FROM agentinformation) a or to be more explicit SELECT a.name FROM (SELECT name FROM agentinformation) a