\a toggle between unaligned and aligned output mode \C [STRING] set table title, or unset if none \f [STRING] show or set field separator for unaligned query output \H toggle HTML output mode (currently off) \pset NAME [VALUE] set table output option (NAME := {format|border|expanded|...
CREATEORREPLACEFUNCTIONexample_function(conditionBOOLEAN)RETURNSVOIDAS$$BEGINIFconditionTHEN-- 执行插入操作INSERTINTOtable_name(column1,column2)VALUES(value1,value2);ELSE-- 执行删除操作DELETEFROMtable_nameWHEREcondition;ENDIF;-- 执行更新操作UPDATEtable_nameSETcolumn1=value1WHEREcondition;E...
set system_id = ir.application_id from t_business_irregular ir where tb.affected_business = ir.application_name update t_business tb set system_id = ir.application_id from t_business_irregular ir where tb.fault_system = ir.application_name update t_business_irregular bi set status = 0 fro...
use_hot_update = true; 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 if(newbuf==buffer){if(!bms_overlap(modified_attrs,hot_attrs))use_hot_update=true;}else{/* Set a hint that the old page could use prune/defrag */PageSetFull(page);}if(use_hot_update){ 第五步:标记H...
(key INT, data TEXT) RETURNS VOID AS $$ BEGIN LOOP -- first try to update the key UPDATE db SET b = data WHERE a = key; IF found THEN RETURN; END IF; -- not there, so try to insert the key -- if someone else inserts the same key concurrently, -- we could get a unique-...
SELECT quantity FROM products WHERE id=3; UPDATE products SET quantity = 1 WHERE id=3; 为什么不安全呢? 少量的状况下或许不会有问题,但是大量的数据存取「铁定」会出问题。 如果我们需要在quantity>0 的情况下才能扣库存,假设程序在第一行SELECT 读到的quantity 是2 ,看起来数字没有错,但是当MySQL 正准...
that are required for your infrastructure. All Terraform commands should now work. If you ever set or change modules or backend configuration for Terraform, rerun this command to reinitialize your working directory. If you forget, other commands will detect it and remind you to do so if ...
SelectSave. Wait until theUpdate succeedednotification appears. Step 7: Verify the Key Vault integration From the left menu, selectSettings > Environment variablesagain. Next toAZURE_POSTGRESQL_PASSWORD, selectShow value. The value should be@Microsoft.KeyVault(...), which means that it's akey va...
If you ever set or change modules or backend configuration for Terraform, rerun this command to reinitialize your working directory. If you forget, other 创建执行计划,并预览变更。 terraform plan 执行以下命令,创建资源。 terraform apply 在执行过程中,根据提示输入yes并按下Enter键,等待命令执行完成,...
ALTEREXTENSION <extension_name>UPDATE; 此命令允许用户手动升级到 Azure 批准的最新版本,简化了数据库扩展的管理,增强了兼容性和安全性。 限制 虽然更新扩展很简单,但也存在一定的限制: 特定版本选择:此命令不支持更新到扩展的中间版本。 它始终会更新到最新可用版本。