SQL


What is SQL?

Structured Query Language (SQL) is a highly popular domain specific language (DSL) used to communicate with relational database management systems (RDBMS). SQL is a standard that is based on the "relational model", defined by professor E.F. Codd, of IBM during the 1960's and 1970s. Codd defined both a relational algebra and a relational calculus as foundational models in his endeavor to reinvent database management systems. This led to his seminal 1970 paper "A Relational Model of Data for Large Shared Data Banks". Commonly used implementations of SQL include Oracle, IBM's DB2, Postgres, MySQL, and SQLite. Notably, SQLite is not a client/server system, but rather an embedded database that is used as a core application-level storage system in macOS, iOS, and Android. There has been much debate over what constitutes a "real" relational system, as some widely used database systems famously lacked features that Codd considered foundational to the relational model, such as "foreign keys". The flexibility of SQL has proven so powerful that many non-relational systems (e.g. Apache Spark) have implemented subsets or variants of the language to make it easier for people to draw upon their capabilities.

How much do SQL developers make?

We don't have enough data for Philadelphia,
so we've calculated your salary information for the San Francisco Bay Area instead:
Based on real Hired interview data, SQL developers in Philadelphia earn an average annual salary of
Based on real Hired interview data, SQL developers in SF Bay Area earn an average annual salary of
$121,360
The salaries of candidates in this role range from a low of $90,000 to a high of $150,000, with a median salary of $120,000.

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SQL Resources

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SQL Engineer Jobs

Test Analyst - US
Test Analyst - US
Job Description<br><br>Infosys -IVS-Financial Services- Functional Testing-Capital Markets, New York, NY<br><br>Infosys is a global leader in next-generation digital services and consulting. We nav...
Test Analyst - US
Test Analyst - US
Job Description<br><br>Infosys -IVS-Financial Services- Functional Testing-Capital Markets, New York, NY<br><br>Infosys is a global leader in next-generation digital services and consulting. We nav...
Senior Software Engineer, Data Platform
Senior Software Engineer, Data Platform
1001-1500 employees
Senior Software Engineer,Data PlatformAppNexus powers the real-time sale and purchase of digital advertising.We simplifythe most sophisticated machine learning and data science capabilities to help...
About AppNexus: AppNexus provides trading solutions and powers marketplaces for Internet advertising.
Senior Software Engineer, Data Platform
1001-1500 employees
Senior Software Engineer, Data Platform
Senior Software Engineer,Data PlatformAppNexus powers the real-time sale and purchase of digital advertising.We simplifythe most sophisticated machine learning and data science capabilities to help...
About AppNexus: AppNexus provides trading solutions and powers marketplaces for Internet advertising.
Senior Business Intelligence Analyst
Senior Business Intelligence Analyst
Wolters Kluwer is a global leader in professional information services. Professionals in the areas of legal, business, tax, accounting, finance, audit, risk, compliance and healthcare rely on Wolte...
Senior Business Intelligence Analyst
Senior Business Intelligence Analyst
Wolters Kluwer is a global leader in professional information services. Professionals in the areas of legal, business, tax, accounting, finance, audit, risk, compliance and healthcare rely on Wolte...
ServiceNow and ITIL/ITS
ServiceNow and ITIL/ITS
Description:<br><br>Implementation of ServiceNow including one or more modules in a large enterprise environment.<br><br>Desired Experience:<br><br>* Strong ITIL / ITSM evaluation and design experi...
ServiceNow and ITIL/ITS
ServiceNow and ITIL/ITS
Description:<br><br>Implementation of ServiceNow including one or more modules in a large enterprise environment.<br><br>Desired Experience:<br><br>* Strong ITIL / ITSM evaluation and design experi...
Sr Applied Scientist
Sr Applied Scientist
5001+ employees
We are seeking a talented, self-directed Senior Applied Scientist to work Amazon Exports and Expansion tech team. You'll design and run experiments, research and productionize new algorithms, and f...
About Amazon: Amazon is an electronic commerce and cloud computing company.
Sr Applied Scientist
5001+ employees
Sr Applied Scientist
We are seeking a talented, self-directed Senior Applied Scientist to work Amazon Exports and Expansion tech team. You'll design and run experiments, research and productionize new algorithms, and f...
About Amazon: Amazon is an electronic commerce and cloud computing company.
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