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SQL-92 was the third revision of the SQL database query language. Unlike SQL-89, it was a major revision of the standard. Aside from a few minor incompatibilities, the SQL-89 standard is forward-compatible with SQL-92. The standard specification itself grew about five times compared to SQL-89.
Successive generations of iSeries and pSeries hardware converged until they were essentially the same hardware sold under different names and with different operating systems. [6] Some i5 servers were still using the AS/400-specific IBM Machine Type (MT/M 9406-520) and were able to run AIX in an LPar along i5/OS, while the p5 servers were able ...
The database evolved from the non-relational System/38 database, gaining support for the relational model and SQL. [1] The database originally had no name, instead it was described simply as "data base support". [54] It was given the name DB2/400 in 1994 to indicate comparable functionality to IBM's other commercial databases. [1]
SQL:1999 (also called SQL 3) was the fourth revision of the SQL database query language. It introduced many new features, many of which required clarifications in the subsequent SQL:2003 . In the meanwhile [ clarification needed ] SQL:1999 is deprecated.
It also generates the SQL or DDS code to define the necessary database tables and views. Synon kept precise productivity metrics during the internal development of its SMA accounting system. In total, 2,385 days of effort were expended on development and QA over a 14-month period, which resulted in the creation of 2.42 million lines of HLL code ...
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
PostgreSQL, MySQL and Oracle support natural joins; Microsoft T-SQL and IBM DB2 do not. The columns used in the join are implicit so the join code does not show which columns are expected, and a change in column names may change the results. In the SQL:2011 standard, natural joins are part of the optional F401, "Extended joined table", package.
Key-Sequenced Datasets (KSDS) are a major upgrade from ISAM: they allow secondary keys with non-unique values and keys formed by concatenating non-contiguous fields in any order; they greatly reduced the performance problems caused by overflow records in ISAM; and they greatly reduced the risk that a software or hardware failure in the middle ...