大约有 7,000 项符合查询结果(耗时:0.0280秒) [XML]

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Efficient SQL test query or validation query that will work across all (or most) databases

...it of research along with help from some of the answers here: SELECT 1 H2 MySQL Microsoft SQL Server (according to NimChimpsky) PostgreSQL SQLite SELECT 1 FROM DUAL Oracle SELECT 1 FROM any_existing_table WHERE 1=0 or SELECT 1 FROM INFORMATION_SCHEMA.SYSTEM_USERS or CALL NOW() HSQLDB (tested ...
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MySQL DISTINCT on a GROUP_CONCAT()

....new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f3083499%2fmysql-distinct-on-a-group-concat%23new-answer', 'question_page'); } ); Post as a guest ...
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How do you version your database schema? [closed]

...ion : http://www.nextep-softwares.com/wiki It currently supports Oracle, MySql and PostgreSql and is in java so the product runs on windows, linux and mac. share | improve this answer | ...
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SQL update from one Table to another based on a ID match

...INNER JOIN RetrieveAccountNumber RAN ON SI.LeadID = RAN.LeadID; MySQL and MariaDB UPDATE Sales_Import SI, RetrieveAccountNumber RAN SET SI.AccountNumber = RAN.AccountNumber WHERE SI.LeadID = RAN.LeadID; ...
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PHP json_encode encoding numbers as strings

...s with PDO and mssql ; but, if I remember correctly, this also happens for MySQL in PHP < 5.3, when the new mysqlnd driver was not yet existing) ;; to check what your data look like, you can use var_dump, which outputs the types of each part of the data. – Pascal MARTIN ...
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Increment a database field by 1

With MySQL, if I have a field, of say logins, how would I go about updating that field by 1 within a sql command? 5 Answers...
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How does “do something OR DIE()” work in PHP?

I'm writing a php app to access a MySQL database, and on a tutorial, it says something of the form 4 Answers ...
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Getting the minimum of two values in SQL

... For MySQL or PostgreSQL 9.3+, a better way is to use the LEAST and GREATEST functions. SELECT GREATEST(A.date0, B.date0) AS date0, LEAST(A.date1, B.date1, B.date2) AS date1 FROM A, B WHERE B.x = A.x With: GREATEST(v...
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Possible to perform cross-database queries with PostgreSQL?

... If you're coming from a MySQL environment, what MySQL calls databases are really schemas (CREATE SCHEMA == CREATE DATABASE in MySQL), so if you porting something from MySQL using multiple databases, use schemas – MkV ...
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大数据能否拯救中国足球? - 资讯 - 清泛网 - 专注C/C++及内核技术

...难。 未来大数据在足球相关产业中的应用前景到底如何?从球队、球员的日常训练到整个职业联赛球员大数据库的建立,从可穿戴设备到体育赛事转播的制作包装,大数据可介入的发力点又在哪里? 事实上,随着80亿中超(...