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Download PostgreSQL : introduction and concepts by Bruce Momjian PDF

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By Bruce Momjian

The open resource PostgreSQL database is hovering in acceptance, as millions of database and internet pros notice its robust gains, transaction help, functionality, and industrial-strength scalability. during this ebook, a founding member of the PostgreSQL improvement crew introduces every thing you want to understand to be successful with PostgreSQL, from simple SQL instructions via database management and optimization. PostgreSQL assumes no earlier database services: it establishes an organization origin of simple recommendations and instructions ahead of turning to PostgreSQL's complicated, leading edge services. Bruce Momjian walks readers step by step from their first database queries in the course of the advanced queries had to clear up real-world difficulties. He provides right question syntax, then explores the worth and use of every key SQL instructions in operating purposes. learn how to control and replace databases, customise queries, paintings with SQL aggregates, use joins, mix SELECTs with subqueries, paintings with triggers and transactions, import and export info, use PostgreSQL question instruments, and extra. notice PostgreSQL thoughts for server-side programming and multi-user keep an eye on, and grasp PostgreSQL's interfaces to C, C++, ODBC, JDBC, Perl, and Tcl/TK. you will additionally locate targeted insurance of PostgreSQL management, together with backups, troubleshooting, and entry configuration

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11. 18: Complex regular expression queries CHAPTER 4. 19: CASE example control over the data returned from a query. The WHERE clause uses comparisons to control row selection. The CASE statement allows comparisons in column output. 19 shows a query using CASE to create a new output column containing adult or minor as appropriate, based on the age field. Of course, the values adult and minor do not appear in the table friend. The CASE clause allows the creation of those conditional strings. 20 shows a more complex example.

The important part of this query appears between the parentheses. 2. The first line, firstname CHAR(15), represents the first column of the table to create. This column is named firstname, and the text CHAR(15) indicates the column type and length. The CHAR(15) means the column holds a maximum of 15 characters. The second column is called lastname and holds a maximum of 20 characters. Columns of type CHAR() hold characters of a specified length. User-supplied character strings 2 that do not fill the 2A character string is a group of characters strung together.

When viewed in psql, any blank numeric field must contain a NULL because no blank number exists. However, there are blank strings, so blank strings and NULL values are displayed in the same way in psql. Of course, they are not the same, so be careful not to confuse the meaning of NULL values in character fields. 4 Controlling DEFAULT Values As we learned in the previous section, columns not specified in an INSERT statement are given NULL values. You can change this assignment by using the DEFAULT keyword.

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