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The DROP statement is distinct from the DELETE and TRUNCATE statements, in that DELETE and TRUNCATE do not remove the table itself. For example, a DELETE statement might delete some (or all) data from a table while leaving the table itself in the database, whereas a DROP statement removes the entire table from the database.
A regular problem with the processing of large tables is that retrieval requires the use of an index, but maintaining this index slows down the addition of new records. Typical practices have been to group additions together and add them as a single bulk transaction, or to drop the index, add the batch of new records and then recreate the index.
PostgreSQL includes built-in support for regular B-tree and hash table indexes, and four index access methods: generalized search trees , generalized inverted indexes (GIN), Space-Partitioned GiST (SP-GiST) [42] and Block Range Indexes (BRIN). In addition, user-defined index methods can be created, although this is quite an involved process.
The top of the information page (before the first section for "Basic information") comes from MediaWiki:Pageinfo-header. It is blank by default, but individual wikis can add content here. For example, on English Wikipedia, the header is used to create a table of contents. The bottom of the information can be customised via MediaWiki:Pageinfo ...
Yes, themes, per page or group CSS, more Yes, page with redirect (module), uploads (module) SamePage: Yes Yes Yes Yes Yes Yes Semantic MediaWiki: Yes Yes, URL blacklist, word blacklist, IP address blocking, CAPTCHAs: Partial: very limited read access control: Yes Yes: Yes, templates and themes, html and css Yes, old page becomes a redirect
The middle and part of the bottom half of the preview screen, showing how the edit from Figure 1-4 looks after saving the page. Wikipedia automatically adds a table of contents for articles that have four or more section headings. At bottom is the now-familiar edit box, so you can make corrections or improvements to your article. 3.
Select the table on the web page. Then click "copy" from the edit menu of your browser. In some browsers you can do this from the popup context menu. Launch visual editor on any page. Then paste the table into the page. If that does not work, click on the insert menu, and then "table". It usually has the first header in the table selected.
Some database implementations adopted the term upsert (a portmanteau of update and insert) to a database statement, or combination of statements, that inserts a record to a table in a database if the record does not exist or, if the record already exists, updates the existing record. This synonym is used in PostgreSQL (v9.5+) [2] and SQLite (v3 ...