SQLite uses an optimization to erase the entire table content without having to visit each row of the table individually. This "truncate" optimization makes the delete run much faster.
Further, we’ll explore the practical usage of the TRUNCATE TABLE statement in SQL and delete thePersonstable data from theAdventureWorks2019database. First, let’s see how many rows the table contains. To do this, we’ll execute the SELECT query with the COUNT(*) function that returns the...
x Data Warehouse Service SQL Syntax Reference 1 GaussDB(DWS) SQL Overview 1 GaussDB(DWS) SQL Overview What Is SQL? SQL is a standard computer language used to control the access to databases and manage data in databases. SQL provides different statements to enable you to: ● Query data. ●...
In Transact-SQL, the ISNULL function replaces null values with a specified value, whereas the expression evaluator ISNULL function returns a Boolean based on whether an expression is null. In Transact-SQL, the ROUND function includes an option to truncate the result set, whereas the expression ...
SQL - Syntax - SQL syntax is a unique set of rules and guidelines to be followed while writing SQL statements. This tutorial gives you a quick start with SQL by listing all the basic SQL Syntax.
Truncate Table Statement TRUNCATE TABLE "table_name";Insert Into Statement INSERT INTO "table_name" ("column1", "column2", ...) VALUES ("value1", "value2", ...);Insert Into Select Statement INSERT INTO "table1" ("column1", "column2", ...) SELECT "column3", "column4", ... ...
After the multiversion function is enabled, the system automatically backs up table data when you delete or modify the data using insert overwrite or truncate, and retains the data for a certain period. You can quickly restore data within the retention period. For details about SQL syntax ...
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SQL query to illustrate revocation of DELETE and TRUNCATE privileges from the user_1. Code: REVOKEDELETE,TRUNCATEONsales_detailsFROMuser_1; Output: In this example, we have revoked user_1’s ability to perform DELETE and TRUNCATE statements. That is, user_1 would not be able to delete one...
sql完整语法（SQLcompletesyntax）sql完整语法（SQL complete syntax）When ALL is used with EXCEPT (EXCEPT ALL), the duplicate rows are not eliminated.C:INTERSECT operator The INTERSECT operator derives a result table by including only rows in TABLE1 and TABLE2 and eliminating all duplicate rows. ...