大约有 374 项符合查询结果（耗时：0.0439秒） [XML]
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...that it's 26(2query) against 9.2(1 query) SELECT SQL_CALC_FOUND_ROWS tblA.*, tblB.id AS 'b_id', tblB.city AS 'b_city', tblC.id AS 'c_id', tblC.type AS 'c_type', tblD.id AS 'd_id', tblD.extype AS 'd_extype', tblY.id AS 'y_id', tblY.ydt AS y_ydt ...
How to do a batch insert in MySQL
...sed within
parentheses and separated by commas.
Example:
INSERT INTO tbl_name (a,b,c) VALUES(1,2,3),(4,5,6),(7,8,9);
share
|
improve this answer
|
follow
...
“’” showing on page instead of “ ' ”
...om this article):
CREATE DATABASE db_name CHARACTER SET utf8;
CREATE TABLE tbl_name (...) CHARACTER SET utf8;
If your table is however already UTF-8, then you need to take a step back. Who or what put the data there. That's where the problem is. One example would be HTML form submitted values which...
SCOPE_IDENTITY() for GUIDs?
...declare @id uniqueidentifier
set @id = NEWID()
INSERT INTO [dbo].[tbl1]
([id])
VALUES
(@id)
select @id
but clustered index problem are there in GUID . read this one tooNEWSEQUENTIALID() .These are my ideas ,think before use GUID as primary Key . :)
...
SQL to determine minimum sequential days of access?
... AND uh1.UserId = uh2.UserId
GROUP BY uh1.Id, uh1.UserId
) as Tbl
WHERE Conseq >= @days
EDIT:
[Jeff Atwood] This is a great fast solution and deserves to be accepted, but Rob Farley's solution is also excellent and arguably even faster (!). Please check it out too!
...
Postgres manually alter sequence
...side: shorter & faster equivalent: SELECT setval('seq', max(col)) FROM tbl; See: stackoverflow.com/a/23390399/939860
– Erwin Brandstetter
Mar 19 '19 at 11:22
...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索
使用虚拟现实和App Inventor进行实验
使...
What are the options for storing hierarchical data in a relational database? [closed]
... TG_ARGV[0] = name of table with entities with PARENT-CHILD relationships (TBL_ORIG)
-- TG_ARGV[1] = name of helper table with ANCESTOR, CHILD, DE
How to convert an entire MySQL database characterset and collation to UTF-8?
...ou will need to check the MySQL manual on how to handle this.
ALTER TABLE tbl_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
share
|
improve this answer
|
fol...
How to change the foreign key referential action? (behavior)
..._name;
ALTER TABLE ADD FOREIGN KEY fk_name(fk_cols)
REFERENCES tbl_name(pk_names) ON DELETE RESTRICT;
share
|
improve this answer
|
follow
|
...