大约有 37,000 项符合查询结果（耗时：0.0230秒） [XML]
How to ALTER multiple columns at once in SQL Server
I need to ALTER the data types of several columns in a table.
13 Answers
13
...
How to find largest objects in a SQL Server database?
...the largest objects in a SQL Server database? First, by determining which tables (and related indices) are the largest and then determining which rows in a particular table are largest (we're storing binary data in BLOBs)?
...
SQL: deleting tables with prefix
How to delete my tables who all have the prefix myprefix_ ?
10 Answers
10
...
How to move columns in a MySQL table?
Currently I am having the following MySQL table: Employees (empID, empName, department);
4 Answers
...
Search All Fields In All Tables For A Specific Value (Oracle)
Is it possible to search every field of every table for a particular value in Oracle?
16 Answers
...
List tables in a PostgreSQL schema
When I do a \dt in psql I only get a listing of tables in the current schema ( public by default).
4 Answers
...
insert a NOT NULL column to an existing table
...
As an option you can initially create Null-able column, then update your table column with valid not null values and finally ALTER column to set NOT NULL constraint:
ALTER TABLE MY_TABLE ADD STAGE INT NULL
GO
UPDATE MY_TABLE SET <a valid not null values for your column>
GO
ALTER TABLE MY_TA...
Best way to select random rows PostgreSQL
...erves nicely.
The query below does not need a sequential scan of the big table, only an index scan.
First, get estimates for the main query:
SELECT count(*) AS ct -- optional
, min(id) AS min_id
, max(id) AS max_id
, max(id) - min(id) AS id_span
FROM big;
The on...
Check for changes to an SQL Server table?
How can I monitor an SQL Server database for changes to a table without using triggers or modifying the structure of the database in any way? My preferred programming environment is .NET and C#.
...
SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?
...
A cross join produces a cartesian product between the two tables, returning all possible combinations of all rows. It has no on clause because you're just joining everything to everything.
A full outer join is a combination of a left outer and right outer join. It returns all row...