DELETEWHEREEventDate=toDate('2014-03-17') Query id:b2452669-68b6-4e5d-8b1e-1a42652f8343 ┌─explain──────────────────────────────────┐ │ AlterQuery tutorial hits_v1(children3)
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...
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 ...
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 示例如下...
1、SQL窗口的,执行SQL后只能去output查看; 2、command window的,需要先设置set serveroutput on size unlimited,然后再执行存储过程 output或者命令窗口查看的真实执行计划和统计信息: SQL_ID abk3ghv9u1tvb, child number 0 --- SELECT /*+ monitor */ * FROM APPR_HANDLE_INFO Plan...
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”...
Describe the problem root@127.0.0.1:26257/movr> \h EXPLAIN Command: EXPLAIN Description: show the logical plan of a query Category: miscellaneous Syntax: EXPLAIN <statement> EXPLAIN ([PLAN ,] <planoptions...> ) <statement> EXPLAIN (DISTS...
EXPLAIN ASTALTERTABLEt1DELETEWHEREdate=today(); ┌─explain──────────────────────────┐ │ AlterQuery t1 (children1) │ │ ExpressionList (children1) │ │ AlterCommand32(children1) │ │Functionequals(children1) │ ...
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}; ...
| 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 +---+---+---+...