Mysql – SELECT * FROM Linked MySQL server

linked-serverMySQLsqlsql serverssms-2012

I have a SQL Server 2012.(120.120.55.15)

Today I linked MySQL server(120.120.55.30) to my SQLServer and gave it a name "MYSQL".

In Object Explorer everything seems fine. I can see MySQL server's database "exampleDataBase" and tables in it.

But when I try to run select query like this:

SELECT * 
FROM   openquery
        (
        MYSQL, 
        '
         SELECT * 
         FROM [exampleDataBase].[msProcMatrix]
        '
        )

I get a mistake:

Msg 7399, Level 16, State 1, Line 1 The OLE DB provider "MSDASQL" for
linked server "MYSQL" reported an error. The provider did not give any
information about the error. Msg 7350, Level 16, State 2, Line 1
Cannot get the column information from OLE DB provider "MSDASQL" for
linked server "MYSQL".

What should be additionally done to use my linked MySQL server?

Best Answer

Found the decision:

SELECT * 
FROM openquery(MYSQL, 'SELECT * FROM exampleDataBase.msProcMatrix')

Without brackets!

Strange for me but works...

Syntax:

ALTER TABLE {TABLENAME} 
ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL} 
CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE}
WITH VALUES

Example:

ALTER TABLE SomeTable
        ADD SomeCol Bit NULL --Or NOT NULL.
 CONSTRAINT D_SomeTable_SomeCol --When Omitted a Default-Constraint Name is autogenerated.
    DEFAULT (0)--Optional Default-Constraint.
WITH VALUES --Add if Column is Nullable and you want the Default Value for Existing Records.

Notes:

Optional Constraint Name:
If you leave out CONSTRAINT D_SomeTable_SomeCol then SQL Server will autogenerate
a Default-Contraint with a funny Name like: DF__SomeTa__SomeC__4FB7FEF6

Optional With-Values Statement:
The WITH VALUES is only needed when your Column is Nullable
and you want the Default Value used for Existing Records.
If your Column is NOT NULL, then it will automatically use the Default Value
for all Existing Records, whether you specify WITH VALUES or not.

How Inserts work with a Default-Constraint:
If you insert a Record into SomeTable and do not Specify SomeCol's value, then it will Default to 0.
If you insert a Record and Specify SomeCol's value as NULL (and your column allows nulls),
then the Default-Constraint will not be used and NULL will be inserted as the Value.

Notes were based on everyone's great feedback below.
Special Thanks to:
@Yatrix, @WalterStabosz, @YahooSerious, and @StackMan for their Comments.

Sql – How to return only the Date from a SQL Server DateTime datatype

SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, @your_date))

for example

SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))

gives me

2008-09-22 00:00:00.000

Pros:

No varchar<->datetime conversions required
No need to think about locale

Best Answer

Related Solutions

Sql – Add a column with a default value to an existing table in SQL Server

Syntax:

Example:

Notes:

Sql – How to return only the Date from a SQL Server DateTime datatype

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