大约有 5,880 项符合查询结果（耗时：0.0354秒） [XML]
Checking if a SQL Server login already exists
...ction. Attacker can pass a @loginName like x] with password ''y'';\r\ndrop table foo;\r\n
– Remus Rusanu
Sep 4 '09 at 14:47
2
...
NULL values inside NOT IN clause
...s one using a not in where constraint and the other a left join . The table in the not in constraint had one null value (bad data) which caused that query to return a count of 0 records. I sort of understand why but I could use some help fully grasping the concept.
...
Difference between a theta join, equijoin and natural join
...uijoin will also remove the equality column if they have same name in both tables.
– Vishal R
Nov 13 '14 at 3:42
1
...
read.csv warning 'EOF within quoted string' prevents complete reading of file
...ng 403 back with read.csv(). Adding quote = "" got me up to 410 rows. read.table() does no better. I wonder what else can be tried...
– Hack-R
Aug 21 '14 at 15:12
2
...
SQL Server reports 'Invalid column name', but the column is present and the query works through mana
...
I suspect that you have two tables with the same name. One is owned by the schema 'dbo' (dbo.PerfDiag), and the other is owned by the default schema of the account used to connect to SQL Server (something like userid.PerfDiag).
When you have an unquali...
For loop example in MySQL
...
drop table if exists foo;
create table foo
(
id int unsigned not null auto_increment primary key,
val smallint unsigned not null default 0
)
engine=innodb;
drop procedure if exists load_foo_test_data;
delimiter #
create procedur...
IN clause and placeholders
...", "name2" }; // do whatever is needed first
String query = "SELECT * FROM table"
+ " WHERE name IN (" + makePlaceholders(names.length) + ")";
Cursor cursor = mDb.rawQuery(query, names);
Just make sure to pass exactly as many values as places. The default maximum limit of host parameters in SQ...
How to prepend a string to a column value in MySQL?
...
UPDATE tablename SET fieldname = CONCAT("test", fieldname) [WHERE ...]
share
|
improve this answer
|
foll...
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
I want to use Oracle SQL Developer to generate an ER diagram for my DB tables but I am new to Oracle and this tool.
8 Answe...
How do I escape a single quote in SQL Server?
I'm trying to insert some text data into a table in SQL Server 9.
13 Answers
13
...