TDengine provides a SQL-style language, TAOS SQL, to insert or query data. To read through this document, you should have some basic understanding about SQL.
TDengine provides a SQL-style language, TAOS SQL, to insert or query data. This document introduces TAOS SQL and supports other common tips. To read through this document, readers should have basic understanding about SQL.
TAOS SQL is the main way for users to write and query data to TDengine. TAOS SQL is similar to standard SQL to facilitate users to get started quickly. Strictly speaking, TAOS SQL is not and does not attempt to provide SQL standard syntax. In addition, since TDengine does not provide deletion function for time-series data, the relevant function of data deletion is non-existent in TAO SQL.
TAOS SQL is the main tool for users to write and query data into/from TDengine. TAOS SQL provides a syntax style similar to standard SQL to facilitate users to get started quickly. Strictly speaking, TAOS SQL is not and does not attempt to provide SQL standard syntax. In addition, since TDengine does not provide deletion functionality for time-series data, the relevant functions of data deletion is unsupported in TAO SQL.
Let’s take a look at the conventions used for syntax descriptions.
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@@ -1244,4 +1244,4 @@ TAOS SQL supports join columns of two tables by Primary Key timestamp between th
**Availability of is no null**
Is not null supports all types of columns. Non-null expression is <> "" and only applies to columns of non-numeric types.
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Is not null supports all types of columns. Non-null expression is <> "" and only applies to columns of non-numeric types.
