forked from docs/doc-exports
Lu, Huayi
346ac31da9
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Reviewed-by: Jiang, Beibei <beibei.jiang@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
83 lines
5.3 KiB
HTML
83 lines
5.3 KiB
HTML
<a name="EN-US_TOPIC_0000001233922193"></a><a name="EN-US_TOPIC_0000001233922193"></a>
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<h1 class="topictitle1">Delete an Index</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_p11532411115112">MySQL supports both <strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b2027031512543">DROP INDEX</strong> and <strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b1227061518544">ALTER TABLE DROP INDEX</strong> for deleting indexes. DSC will perform adaptation based on GaussDB features during migration.</p>
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<ol id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_ol9597141171115"><li id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li1359714141114">DROP INDEX<p id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_p6923191441210"><a name="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li1359714141114"></a><a name="en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li1359714141114"></a><strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b172711153541">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_screen2075817255126">CREATE TABLE `test_create_table03` (
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`DEMAND_ID` INT(11) NOT NULL,
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`DEMAND_NAME` CHAR(100) NOT NULL,
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`THEME` VARCHAR(200) NULL DEFAULT NULL,
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`SEND_ID` INT(11) NULL DEFAULT NULL,
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`SEND_NAME` CHAR(20) NULL DEFAULT NULL,
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`SEND_TIME` DATETIME NULL DEFAULT NULL,
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`DEMAND_CONTENT` TEXT NOT NULL
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)
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COLLATE='utf8_general_ci'
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ENGINE=InnoDB;
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CREATE UNIQUE INDEX DEMAND_NAME_INDEX ON TEST_CREATE_TABLE03(DEMAND_NAME);
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DROP INDEX DEMAND_NAME_INDEX ON TEST_CREATE_TABLE03;
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CREATE INDEX SEND_ID_INDEX ON TEST_CREATE_TABLE03(SEND_ID);
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DROP INDEX SEND_ID_INDEX ON TEST_CREATE_TABLE03;</pre>
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<p id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_p18349428171219"><strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b1327110154546">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_screen1227033412127">CREATE TABLE "public"."test_create_table03"
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(
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"demand_id" INTEGER(11) NOT NULL,
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"demand_name" CHAR(100) NOT NULL,
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"theme" VARCHAR(200) DEFAULT NULL,
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"send_id" INTEGER(11) DEFAULT NULL,
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"send_name" CHAR(20) DEFAULT NULL,
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"send_time" TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
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"demand_content" TEXT NOT NULL
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("demand_id");
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CREATE INDEX "demand_name_index" ON "public"."test_create_table03" ("demand_name");
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DROP INDEX "demand_name_index" RESTRICT;
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CREATE INDEX "send_id_index" ON "public"."test_create_table03" USING BTREE ("send_id");
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DROP INDEX "send_id_index" RESTRICT;</pre>
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</li><li id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li99313585112">ALTER TABLE DROP INDEX<p id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_p636619384129"><a name="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li99313585112"></a><a name="en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_li99313585112"></a><strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b32711156544">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_screen123668384128">CREATE TABLE `test_create_table03` (
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`DEMAND_ID` INT(11) NOT NULL,
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`DEMAND_NAME` CHAR(100) NOT NULL,
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`THEME` VARCHAR(200) NULL DEFAULT NULL,
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`SEND_ID` INT(11) NULL DEFAULT NULL,
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`SEND_NAME` CHAR(20) NULL DEFAULT NULL,
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`SEND_TIME` DATETIME NULL DEFAULT NULL,
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`DEMAND_CONTENT` TEXT NOT NULL
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)
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COLLATE='utf8_general_ci'
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ENGINE=InnoDB;
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ALTER TABLE TEST_CREATE_TABLE03 ADD UNIQUE INDEX TEST_CREATE_TABLE03_NAME_INDEX(DEMAND_NAME(50));
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ALTER TABLE TEST_CREATE_TABLE03 DROP INDEX TEST_CREATE_TABLE03_NAME_INDEX;</pre>
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<p id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_p17366193816128"><strong id="EN-US_TOPIC_0000001233922193__en-us_topic_0237712416_b14272115165410">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001233922193__en-us_topic_0238518448_en-us_topic_0237362258_en-us_topic_0214164733_screen936612384127">CREATE TABLE "public"."test_create_table03"
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(
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"demand_id" INTEGER(11) NOT NULL,
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"demand_name" CHAR(100) NOT NULL,
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"theme" VARCHAR(200) DEFAULT NULL,
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"send_id" INTEGER(11) DEFAULT NULL,
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"send_name" CHAR(20) DEFAULT NULL,
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"send_time" TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
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"demand_content" TEXT NOT NULL
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("demand_id");
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CREATE INDEX "test_create_table03_name_index" ON "public"."test_create_table03" ("demand_name");
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DROP INDEX "test_create_table03_name_index" RESTRICT;</pre>
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</li></ol>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_sct_0013.html">MySQL Syntax Migration</a></div>
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</div>
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</div>
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