DELETEWHEREEventDate=toDate('2014-03-17') Query id:b2452669-68b6-4e5d-8b1e-1a42652f8343 ┌─explain──────────────────────────────────┐ │ AlterQuery tutorial hits_v1(children3)│ │ ExpressionList(children1)│ │ AlterCommandDELETE(children1)│ ...
SQL 语句 通用语法 通用表表达式 ALTER DATABASE ALTER OUTLINE ALTER SEQUENCE MERGE ALTER TABLE ALTER TABLEGROUP ALTER USER ALTER VIEW ANALYZE CREATE DATABASE CREATE INDEX CREATE OUTLINE DROP RESTORE POINT CREATE SEQUENCE CREATE TABLE CREATE TABLEGROUP CREATE USER CREATE VIEW DEALLOCATE PREPARE DELETE DESC...
sqlplus一般要数据库管理员才可以使用,如果你不是dba,只能使用plsql developer的话,只能用下面的方法,方法是从培训中学到的 使用存储过程,SQL: declare b1 date; begin execute immediate 'alter session set statistics_level=ALL'; b1 := sysdate - 1; for test in ( /*业务SQL(sql后面不需要加";")*/ s...
In the Display area, check Line numbers. Select OK.Example EXPLAIN outputThe XML result of the EXPLAIN command with row numbers turned on is:XML Kopiera 1 \<?xml version="1.0" encoding="utf-8"?> 2 <dsql_query> 3 <sql>SELECT CAST (AVG(YearlyIncome) AS int) AS AverageIncome, 4 ...
you may be able toimprove the performance of your query by examining the WHERE clause to checkwhether it refers to some column or columns that would be suitable forindexing. If so, create an appropriate index and check the query with EXPLAINagain. See Section 12.1.7, “ALTER TABLE Syntax”...
AlterQueryt1(children1)ExpressionList(children1)AlterCommand27(children1)Functionequals(children1)ExpressionList(children2)Identifier date Functiontoday(children1)ExpressionList EXPLAIN SYNTAX 在语法优化后返回查询。 可以使用此语法进行判断sql是否是当前查询方式的最佳性能,可以查看一些sql是会进行谓词下推 ...
EXPLAIN ASTALTERTABLEt1DELETEWHEREdate=today(); ┌─explain──────────────────────────┐ │ AlterQuery t1 (children1) │ │ ExpressionList (children1) │ │ AlterCommand32(children1) │ │Functionequals(children1) │ ...
SQLite - ALTER Command SQLite - TRUNCATE Command SQLite - Views SQLite - Transactions SQLite - Subqueries SQLite - AUTOINCREMENT SQLite - Injection SQLite - EXPLAIN SQLite - VACUUM SQLite - Date & Time SQLite - Useful Functions SQLite Interfaces SQLite - C/C++ SQLite - Java SQLite - PHP SQLite...
| cleaning up | 0.000018 | dispatch_command | sql_parse.cc | 1417 | +---+---+---+---+---+ 25 rows in set (0.00 sec) 1 mysql> show profile sourceforquery 2; 1 2 3 4 5 6 7 8 9 10 11 12 13 +---+---+---+...
A user with theVIEWACTIVITYsystem privilegecan generate a bundle for any statement. To grant this privilege, issue the following SQL commands. Replace{user}with the user's ID. ALTERUSER{user}WITHVIEWACTIVITY;GRANTSYSTEMVIEWSYSTEMTABLETO{user}; ...