Syntax

Table of Contents



The Katzebase SQL dialect (KBSQL) is very similar to T-SQL. Statements do not need to be separated by semicolons or any other terminator; a script can simply list one statement after another. Statements are used to create and alter schemas and indexes; to insert, read, update and delete documents; to manage accounts and permissions; and to run system procedures.
The statements fall into two groups: (1) DML, or data manipulation language, for selecting, inserting, updating and deleting documents, and (2) DDL, or data definition language, for objects such as schemas, indexes, accounts and roles. See DML Glossary and DDL Glossary.

Sample data

The examples use the WordList sample database (see the home page) and the built-in Single schema.


A schema is a container of documents, indexes and other schemas. Schemas are nested and their names are separated with colons, for example WordList:Word is the Word schema inside the WordList schema. A document is a set of field/value pairs. Documents in the same schema do not need to have the same fields.
  • Keywords, schema names, field names and function names are not case-sensitive.
  • String comparisons with =, != and LIKE are not case-sensitive.
  • Strings are enclosed in single (or double) quotes.
  • Comments start with -- (until the end of the line) or are enclosed in /* and */.

See Expressions for literals, operators and variables.


round-pushpin Selects all fields from the Word schema.
SELECT * FROM WordList:Word

round-pushpin Selects specific fields from the Word schema for a given Text.
SELECT
    Id, Text, LanguageId
FROM
    WordList:Word
WHERE
    Text = 'Dog'


round-pushpin Inserts two documents using a field list and a values list.
INSERT INTO WordList:Word (Id, Text, LanguageId)
VALUES (1000, 'Sarah', 1), (1001, 'Brightman', 1)

round-pushpin Inserts two documents using field: value pairs. The fields can be different for each document.
INSERT INTO WordList:Word
(Id: 1002, Text: 'Neward', LanguageId: 1),
(Id: 1003, Text: 'Katzebase')


round-pushpin Updates the document with the given Id.
UPDATE
    WordList:Word
SET
    Text = 'Newark',
    LanguageId = 2
WHERE
    Id = 1002


round-pushpin Deletes documents by Text.
DELETE FROM
    WordList:Word
WHERE
    Text = 'Newark'



round-pushpin Creates a schema inside the existing WordList schema.
CREATE SCHEMA WordList:Definitions


round-pushpin Drops a schema with all of its documents, indexes and child schemas.
DROP SCHEMA WordList:Definitions


round-pushpin Creates a composite index.
CREATE INDEX IX_Word_LanguageId_Text
(
    LanguageId,
    Text
) ON WordList:Word


round-pushpin Drops an index.
DROP INDEX IX_Word_LanguageId_Text ON WordList:Word


round-pushpin Lists the connected processes.
EXEC ShowProcesses




SQL :: ShowThreadPools
Shows the threads of the engine's thread pools (lookup, indexing, intersection and materialization) and their processor usage.
SQL :: ShowTransactions
Shows every active transaction, optionally for a single process.
SQL :: ShowVersion
Shows the names and versions of the engine's assemblies, or of every loaded assembly when showAll is true.
SQL :: ShowWaitingLocks
Shows the processes that are currently blocked waiting for a lock, optionally for a single process.
SQL :: Single
A built-in schema containing exactly one document, used to evaluate constant expressions.
SQL :: Sleep
Pauses the executing query for the given number of milliseconds. Useful for testing locking and timeouts.
SQL :: SubString
Returns length characters of the value, starting at the zero-based startIndex.
SQL :: Sum
Returns the total of the values in each group.
SQL :: System Procedures
Built-in procedures for inspecting and managing the database engine.
SQL :: Terminate
Terminates a process: rolls back its transaction, disconnects it and frees its resources. Kill does the same thing.