UPDATE table_name: Specifies the table that has to be updated CASE WHEN: Declares conditions to assign different values to different rows WHERE column_name IN(…): Ensures that only specific records are updated Example: -- To update the role of multiple employees UPDATE Intellipaat SET role...
UPDATEupdates rowsineachtablenamedintable_references that satisfy the conditions. Each matching rowisupdatedonce, evenifit matches the conditions multiple times.Formultiple-tablesyntax,ORDERBYandLIMIT cannot be used.Forpartitioned tables, both thesingle-singleandmultiple-tableformsofthis statement ...
优化前:SQL 执行超时被 kill 了 SELECTid,...,creator,modifier,create_time,update_timeFROMstatementWHERE(account_number='XXX'ANDcreate_time>='2022-04-24 06:03:44'ANDcreate_time<='2022-04-24 08:03:44'ANDdc_flag='C')ORDERBYcreate_timeDESC,idDESCLIMIT0,1000; 优化后:执行总行数为:6 行,...
Evaluates a list of conditions and returns one of multiple possible result expressions. TheCASEexpression has two formats: The simpleCASEexpression compares an expression to a set of simple expressions to determine the result. The searchedCASEexpression evaluates a set of Boolean expressions to determin...
In the case of %FOUND, if any DML statement, such as INSERT, DELETE or UPDATE, effects one or more rows, or if a SELECT INTO statement returns at least one row, this method returns TRUE.Discuss this Question 83. What is TRUE about %ISOPEN in PL/SQL Cursor?
Variable names can be used in UPDATE statements to show the old and new values affected, but this should be used only when the UPDATE statement affects a single record. If the UPDATE statement affects multiple records, to return the old and new values for each record, use the OUTPUT clause...
Specify whether a deferrableintegrity constraintis checked following each DML statement or when the transaction is committed (SET CONSTRAINT). The following example starts a transaction namedUpdate salaries. The example creates a savepoint, updates an employee salary, and then rolls back the transaction...
git_repos_pull.sh - pull multiple repos based on a source file mapping list - useful for easily sync'ing lots of Git repos among computers git_repos_update.sh - same as above but also runs the make update build to install the latest dependencies, leverages the above script git_grep_env...
SQL1301NAn error occurred when accessing the server's DCE keytab file. Explanation An error occurred when accessing the server's DCE keytab file. For a keytab file to be valid, the following conditions must be satisfied: The server's keytab file exists, has the name keytab.db2, and is in...
When the condition comes back false for one part of theUNIONALLquery, that part is not evaluated further. Only the part of the execution plan that is optimum for the values provided is actually carried out. Because the final conditions on:hivaland:lovalare guaranteed to be mutually exclusive,...