大约有 40,000 项符合查询结果（耗时：0.0405秒） [XML]
conditional unique constraint
...unt > 0.
http://msdn.microsoft.com/en-us/library/ms188258.aspx
CREATE TABLE CheckConstraint
(
Id TINYINT,
Name VARCHAR(50),
RecordStatus TINYINT
)
GO
CREATE FUNCTION CheckActiveCount(
@Id INT
) RETURNS INT AS BEGIN
DECLARE @ret INT;
SELECT @ret = COUNT(*) FROM CheckConstraint WHER...
How to set a default entity property value with Hibernate
...ld not recommend using columnDefinition for this situation, this is not portable from a database to another, and you need to know the specific SQL language of your server.
– pdem
Sep 20 '16 at 7:30
...
Copy/duplicate database without using mysqldump
...
You can duplicate a table without data by running:
CREATE TABLE x LIKE y;
(See the MySQL CREATE TABLE Docs)
You could write a script that takes the output from SHOW TABLES from one database and copies the schema to another. You should be abl...
How to get ERD diagram for an existing database?
...ings (also called referential integrity constraints) in a graph style. The table nodes and relations are layed out automatically, with a number of layout modes available. The resulting graph is unique as it displays all information in an optimal and readable layout.
from its site
...
Apply style to only first level of td tags
...
This style:
table tr td { border: 1px solid red; }
td table tr td { border: none; }
gives me:
this http://img12.imageshack.us/img12/4477/borders.png
However, using a class is probably the right approach here.
...
Select datatype of the field in postgres
How do I get datatype of specific field from table in postgres ?
For example
I have the following table,
student_details (
stu_id integer,
stu_name varchar(30 ),
joined_date timestamp
);
...
How to Get True Size of MySQL Database?
...SQL database use, in order to select a web host.
I found the command SHOW TABLE STATUS LIKE 'table_name' so when I do the query, I get something like this:
...
How to take backup of a single table in a MySQL database?
...sqldump takes the backup of an entire database. I need to backup a single table in MySQL. Is it possible? How do I restore it?
...
resizes wrong; appears to have unremovable `min-width: min-content`
...nge the display property of the fieldset to one of the following values:
table-cell (recommended)
table-column
table-column-group
table-footer-group
table-header-group
table-row
table-row-group
Of these, I recommend table-cell. Both table-row and table-row-group prevent you from changing width, ...
Printing the value of a variable in SQL Developer
...
DECLARE
CTABLE USER_OBJECTS.OBJECT_NAME%TYPE;
CCOLUMN ALL_TAB_COLS.COLUMN_NAME%TYPE;
V_ALL_COLS VARCHAR2(5000);
CURSOR CURSOR_TABLE
IS
SELECT OBJECT_NAME
FROM USER_OBJECTS
WHERE OBJECT_TYPE='TABLE'
AND OBJ...