大约有 1,948 项符合查询结果（耗时：0.0149秒） [XML]
Select something that has more/less than x character
...nks.
Here's the link to the MSDN
For oracle/plsql you can use Length(), mysql also uses Length.
Here is the Oracle documentation:
http://www.techonthenet.com/oracle/functions/length.php
And here is the mySQL Documentation of Length(string):
http://dev.mysql.com/doc/refman/5.1/en/string-functi...
When NOT to use Cassandra?
...ase of RDBMS, making a choice is quite easy because all the databases like MySQL, Oracle, MS SQL, PostgreSQL in this category offer almost the same kind of solutions oriented toward ACID properties. When it comes to NoSQL, the decision becomes difficult because every NoSQL database offers different ...
What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]
...rence between INNER JOIN , LEFT JOIN , RIGHT JOIN and FULL JOIN
in MySQL ?
3 Answers
...
What columns generally make good indexes?
...er to use index */
Since "buyer_id" is referenced in the SELECT portion, MySQL will not use it to limit the chosen rows. Hence, there is no great need to index it. The below is another example little different from the above one:
SELECT
buyers.buyer_id, /* no need to index */
country.name /*...
Sequelize Unknown column '*.createdAt' in 'field list'
...ize('sequelize_test', 'root', null, {
host: "127.0.0.1",
dialect: 'mysql',
define: {
timestamps: false
}
});
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What database does Google use?
Is it Oracle or MySQL or something they have built themselves?
8 Answers
8
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Run php script as daemon process
... service:
[Unit]
Description=My PHP Daemon Service
#May your script needs MySQL or other services to run, eg. MySQL Memcached
Requires=mysqld.service memcached.service
After=mysqld.service memcached.service
[Service]
User=root
Type=simple
TimeoutSec=0
PIDFile=/var/run/myphpdaemon.pid
ExecStart=/u...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
Error message on MySql:
7 Answers
7
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Find the number of columns in a table
...
In MySQL land (tagged in the question)... A MySQL database is equivalent to a schema in ANSI SQL and the table_catalog is always def
– Steve Buzonas
Mar 5 '14 at 18:17
...
SQL Logic Operator Precedence: And and Or
...in alphabetic order):
Microsoft Transact-SQL operator precedence
Oracle MySQL 9 operator precedence
Oracle 10g condition precedence
PostgreSQL operator Precedence
SQL as understood by SQLite
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